Perhaps you should try some spelling variations:
"do sanh va thuat do thi" » "do sanh ky thuat do thi", "do sanh ki thuat do thi", "do sanh va thuc do thi", "do sanh va thuat o thi", "do hanh va thuat do thi", "do anh va thuat do thi", "do sinh va thuat do thi"
"tu cach tam than vo thi" » "tu cach lam than vo thi", "tu cach ta than vo thi", "tu sach tham than vo thi", "tu cach ban than vo thi", "tu cac tam than vo thi", "tu cach tam than va thi", "tu cach tam than hoc thi", "tu cach tam thang va thi", "tu cach tam than vu thi"
"thu canh tam than doc thi" » "thu canh ban than doc thi", "thuc hanh tam than doc thi", "thu cong tam than doc thi", "thu ban tam than doc thi", "thu canh tac than doc thi", "thu canh tay than doc thi", "thu hanh tam than doc thi", "thu canh tam than duc thi", "thu canh tam than doan thi", "thu canh tam than dong thi"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("do sanh va thuat do thi") or ((("tu cach tam than vo thi") or ("thu canh tam than doc thi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("do sanh va thuat do thi") OR ((("tu cach tam than vo thi") OR ("thu canh tam than doc thi")))).
• Removing quotes may allow a broader search: (( do sanh va thuat do thi ) or ((( tu cach tam than vo thi ) or ( thu canh tam than doc thi )))).
• Adding a wildcard symbol may retrieve word variants: (("do sanh va thuat do thi") or ((("tu cach tam than vo thi") or ("thu canh tam than doc thi"))))*.