Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cac nhung » cac chung, cam nhung, cac phuong
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (ho chieu)) tach - thanh trong cac nhung ((cong dan) or (cong tan)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (ho chieu)) tach - thanh trong cac nhung ((cong dan) OR (cong tan)) than cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (ho chieu)) tach - thanh trong cac nhung ((cong dan) or (cong tan)) than cau*.