Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh tung » thanh cong
hoc thien » hoc hien, hoc thieu, hoc thiet
phong van » thong van, phong va, hong van
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam
tung va » trung va, tuong va, dung va

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 hach - thanh tung va nhung ((phong van) or (phung van)) ((than cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh tung va nhung ((phong van) OR (phung van)) ((than cau) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh tung va nhung ((phong van) or (phung van)) ((than cau) or (khan cap))*.