Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
trinh cua » trinh luat, trinh quan, trinh luan
hang cong » dang cong, hang nong, bang cong
tinh cua » sinh cua, tinh chat, tranh cua
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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 manh - hanh ((trinh cua) or (tinh cua)) hang cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - hanh ((trinh cua) OR (tinh cua)) hang cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - hanh ((trinh cua) or (tinh cua)) hang cong tan than cau*.