Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
nang quan » ban quan, nang suat
hang luan » tang luan, dung luan
dung cong » dung trong
cong san » cong tac
san than » sang than, san thanh, 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 thien thanh - anh ((nang quan) or (hang luan)) dung cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien thanh - anh ((nang quan) OR (hang luan)) dung cong san than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - anh ((nang quan) or (hang luan)) dung cong san than cau*.