Perhaps you should try some spelling variations:
thanh tung » thanh cong
luong cong » dung cong, trong cong, cong cong
dap luong » dai luong, da luong, do luong
doc hieu » toc thieu, hoc thieu
tung dap » tung dan, trung dai, tuong dan
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
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: ((doc hieu) OR (hoc hien)) xanh - thanh tung dap luong cong san ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) xanh - thanh tung dap luong cong san ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (hoc hien)) xanh - thanh tung dap luong cong san ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (hoc hien)) xanh - thanh tung dap luong cong san ((toan cau) or (toan cao))*.