Perhaps you should try some spelling variations:
thanh trung » thanh tung
thuyet tach » thuyet mach, thuyet hach, thuyet cac
thuyet xac » thuyet va, thuyet bai
trung cap » truong cao, trung tam
cong dan » cong san, cong tan, cong dong
than cau » toan cau, phan cau, than cap
cap van » cac van, cao van, tap 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 ((thuyet tach) OR (thuyet xac)) - thanh trung cap van ((cong dan) or (huong dan)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuyet tach) OR (thuyet xac)) - thanh trung cap van ((cong dan) OR (huong dan)) than cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuyet tach) OR (thuyet xac)) - thanh trung cap van ((cong dan) or (huong dan)) than cau*".