Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thiet, hoc tien
hoc thieu » toc thieu, hoc hien
nang quan » ban quan, nang suat
hang luan » tang luan, dung luan
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van 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) OR (hoc thieu)) thanh - anh ((nang quan) or (hang luan)) dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thieu)) thanh - anh ((nang quan) OR (hang luan)) dung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) OR (hoc thieu)) thanh - anh ((nang quan) or (hang luan)) dung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) OR (hoc thieu)) thanh - anh ((nang quan) or (hang luan)) dung cong dan than cau*.