Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
truong thi » truong thpt, truong dai, luong thi
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
trung thi » trong thi, trung tri, trung tai
cong san » cong tac
toan tap » toan ban

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