Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
khong cong » khong cang, chong cong, khong con
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, mot chieu
hoc thieu » toc thieu, hoc hien
van tuan » van quan, van ban, anh tuan
tuan tap » toan tap, tuan tai, tuyen tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (hoc thieu)) tinh - hanh trinh thuc ((khong cong) OR (thong cong)) van tuan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) tinh - hanh trinh thuc ((khong cong) OR (thong cong)) van tuan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) tinh - hanh trinh thuc ((khong cong) OR (thong cong)) van tuan tap*".