Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
nang cong » nang song, dang cong, bang cong
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
hieu ca » hieu cac, hieu cua, hieu va
va nang » van nang, da nang, cam nang

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