Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hanh trang » thanh trung, canh tranh, hanh trinh
tao thiet » tai thiet, tay thiet, toan thiet
van dung » van dong, tin dung
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thuyet) or (tao thiet)) tach - hanh trang ((van dung) or (xay dung)) cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thuyet) OR (tao thiet)) tach - hanh trang ((van dung) OR (xay dung)) cong tan toan ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc thuyet) or (tao thiet)) tach - hanh trang ((van dung) or (xay dung)) cong tan toan ban*.