Perhaps you should try some spelling variations:
"thu canh tranh khong khi đong luc" » "thu canh trinh khong khi đong luc", "thu canh tran hong khi đong luc", "thu canh tranh hang khi đong luc", "thu canh tranh khong he đong luc", "thuc hanh tranh khong khi đong luc", "thu cong tranh khong khi đong luc", "thu ban tranh khong khi đong luc"
"vu sach tran dong ha đong luc" » "vu sach tranh dong ha đong luc", "vu sach tren dong ha đong luc", "vu vach tran dong ha đong luc", "vu sach tran hong ha đong luc", "vu sach tran dang ha đong luc", "vu sach tran dung ha đong luc", "vu bach tran dong ha đong luc", "su sach tran dong ha đong luc", "vu khach tran dong ha đong luc", "vu sach tran dong hoa đong luc", "vu sach tran dong va đong luc", "vu sach tran dong hoc đong luc"

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: (("thu canh tranh khong khi đong luc") or ("vu sach tran dong ha đong luc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thu canh tranh khong khi đong luc") OR ("vu sach tran dong ha đong luc")).
• Removing quotes may allow a broader search: (( thu canh tranh khong khi đong luc ) or ( vu sach tran dong ha đong luc )).
• Adding a wildcard symbol may retrieve word variants: (("thu canh tranh khong khi đong luc") or ("vu sach tran dong ha đong luc"))*.