Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu sach » chieu sach, dien sach, te sach
nang man » nang ban, lang man, nang can
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man
nang ma » tang ma, sang ma, nang cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - anh ((nang ma) or (nang man)) nhung cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh ((nang ma) OR (nang man)) nhung cong dan than ban.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh ((nang ma) or (nang man)) nhung cong dan than ban*.