Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
hoc thieu » hoc hien
tinh cong » trinh cong, tinh cuong, minh cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than van » thanh van, tran van, phan van
than va » thanh va, nhan va, toan va
va tinh » may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (toc thieu)) sang - doanh than va tinh cong dan than van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sang - doanh than va tinh cong dan than van*.