Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
toan thiet » hoan thien, luan thiet, toan tien
hoc thien » hoc hien, hoc thieu, hoc thiet
hung cong » nhung cong, hung cuong, phung cong
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan ap » khan cap, han ap, khan dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien thanh - tinh ((toan khoa) or (toan thiet)) hung cong tan khan ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - tinh ((toan khoa) OR (toan thiet)) hung cong tan khan ap.
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - tinh ((toan khoa) or (toan thiet)) hung cong tan khan ap*.