Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tay thiet » tai thiet, tao thiet, toan thiet
dung cong » dung trong
tran van » luan van
quan van » luan van, quan va, quan luan
cong tan » cong tac, cong san, cong thanh
tran ban » tranh ban, toan ban, tran bai

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) or (tay thiet)) tach - hanh ((tran van) or (quan van)) dung cong tan tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (tay thiet)) tach - hanh ((tran van) OR (quan van)) dung cong tan tran ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (tay thiet)) tach - hanh ((tran van) or (quan van)) dung cong tan tran ban*.