Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
tang quang » dang quang, tang quan, hang quang
quang dung » quang trung, ung dung, cuong dung
hoc thieu » toc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
than cao » toan cao, thai cao, 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 thieu xanh - anh tang quang dung ((cong tan) OR (cong san)) than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - anh tang quang dung ((cong tan) OR (cong san)) than cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - anh tang quang dung ((cong tan) OR (cong san)) than cao*.