Perhaps you should try some spelling variations:
hien thanh » thien thanh, hien hanh, tien thanh
toan thiet » hoan thien, luan thiet, toan tien
phung cong » nhung cong, phong cong, nhung chong
cong ban » cong bang, cong san, cong tan
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien thanh - tinh ((van thu) or (toan thiet)) phung cong ban khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien thanh - tinh ((van thu) OR (toan thiet)) phung cong ban khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc hien thanh - tinh ((van thu) or (toan thiet)) phung cong ban khan cap*.