Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
truong va » truong dai, truong cao, truong dao
trung va » trang va, trung ha, trung tam
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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

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