Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
truong cao » truong dai
cong thanh » dong thanh, cong trinh, truong thanh
hoc thieu » toc thieu, hoc hien
trung cao » trung cap, trung co, trung ca
cong tan » cong tac, cong san, cong ty
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 xanh - thanh ((trung cao) OR (truong cao)) dung ((cong thanh) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((trung cao) OR (truong cao)) dung ((cong thanh) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((trung cao) OR (truong cao)) dung ((cong thanh) or (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((trung cao) OR (truong cao)) dung ((cong thanh) or (cong tan)) toan cau*.