Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tai thiet » tao thiet, tay thiet, toan thiet
trinh han » trinh quan
dong cong » duong cong, dung cong, dang cong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

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