Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
dan than » dan chan, ban than, van than
cong ha » cong hoa, cong tac, cong san
dong ha » dong hoa, dong va, dong hoc

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 xanh - thanh ((cong ha) OR (dong ha)) hang cong ((manh toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((cong ha) OR (dong ha)) hang cong ((manh toan) OR (dan than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((cong ha) OR (dong ha)) hang cong ((manh toan) or (dan than)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((cong ha) OR (dong ha)) hang cong ((manh toan) or (dan than)) cao*.