Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
hang cong » dang cong, hang nong, bang cong
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
toan ban » van ban
va hang » van hang, va nang, va lang

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 sach) or (chinh sach)) - thanh trung va hang cong dan ((toan ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chinh sach)) - thanh trung va hang cong dan ((toan ban) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chinh sach)) - thanh trung va hang cong dan ((toan ban) or (toan tap))*.