Perhaps you should try some spelling variations:
"tu hanh trinh thi" » "tu canh tranh thi", "tu hanh chinh thi", "tu hanh trinh tai", "tu hanh dinh thi", "tu hanh trinh tu", "du hanh trinh thi", "lu hanh trinh thi", "thi hanh trinh thi"
"tu can tranh tri" » "tu canh tranh tri", "tu tan tran tri", "tu van ranh tri", "tu can trang tri", "tu can thanh tri", "tu can tran tri", "tu ban tranh tri", "tu cac tranh tri", "thu canh tranh tri"
"thuc hanh tinh tri" » "thuc nhanh tinh tri", "thuc thanh tinh tri", "thuc canh tinh tri", "thuc hanh dinh tri", "thuc hanh minh tri", "thuc hanh chinh tri"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("tu can tranh tri") or ((("thuc hanh tinh tri") or ("tu hanh trinh thi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu can tranh tri") OR ((("thuc hanh tinh tri") OR ("tu hanh trinh thi")))).
• Removing quotes may allow a broader search: (( tu can tranh tri ) or ((( thuc hanh tinh tri ) or ( tu hanh trinh thi )))).
• Adding a wildcard symbol may retrieve word variants: (("tu can tranh tri") or ((("thuc hanh tinh tri") or ("tu hanh trinh thi"))))*.