Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
thien hach » thien thanh, hien hanh
trung cao » truong cao, trung cap, trung co
han cong » phan cong, hang cong, hanh cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
cao han » cao nhan, cao phan, cao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) or (thien hach)) - thanh trung cao han cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (thien hach)) - thanh trung cao han cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (thien hach)) - thanh trung cao han cong dan toan cau*.