Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu hach » chieu sach, hieu cach, thieu cac
thien hach » thien thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
trung van » truong van, trong van, trung va
van nhung » van nhuong, va nhung, van hung
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: hoc ((thieu hach) OR (thien hach)) - thanh trung van nhung cong san ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hach) OR (thien hach)) - thanh trung van nhung cong san ((toan cau) OR (toan cao))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) OR (thien hach)) - thanh trung van nhung cong san ((toan cau) or (toan cao))*".