Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh doanh » chinh doanh, doanh doanh, kinh doanh
hang doanh » nhung doanh, van doanh, dung doanh
hoc thieu » toc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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 sang - ((hanh doanh) or (hang doanh)) va nhung ((cong dan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((hanh doanh) OR (hang doanh)) va nhung ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - ((hanh doanh) or (hang doanh)) va nhung ((cong dan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((hanh doanh) or (hang doanh)) va nhung ((cong dan) OR (cong san)) toan cau*.