Perhaps you should try some spelling variations:
thiet thanh » thien thanh, thi thanh, viet thanh
toan thuat » toan thuc, toan thiet, toan thue
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hung cong » nhung cong, hung cuong, phung cong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than ap » than cap, han ap, khan 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 thiet thanh - tinh ((toan thuat) or (luan thiet)) hung cong ban than ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet thanh - tinh ((toan thuat) OR (luan thiet)) hung cong ban than ap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet thanh - tinh ((toan thuat) or (luan thiet)) hung cong ban than ap*.