Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
toan thuat » toan thuc, toan thiet, toan thue
phung cong » nhung cong, phong cong, nhung chong
hoc thien » hoc hien, hoc thieu, hoc thiet
cong tan » cong tac, cong san, cong thanh
tan han » tan nhan, tran han, tan van
han ap » han tap, khan ap, dan ap
luan » quan, lan

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 thuat) or (luan thiet)) phung cong tan han ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - tinh ((toan thuat) OR (luan thiet)) phung cong tan han ap.
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - tinh ((toan thuat) or (luan thiet)) phung cong tan han ap*.