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 tan » cong tac, cong san, cong thanh
than ban » thanh ban, toan ban, nhuan ban
than man » than ma, thanh san, tran manh
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 tan ((than ban) OR (than man))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh ((nang ma) OR (nang man)) nhung cong tan ((than ban) OR (than man)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh ((nang ma) or (nang man)) nhung cong tan ((than ban) OR (than man))".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh ((nang ma) or (nang man)) nhung cong tan ((than ban) OR (than man))*.