Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu sach » chieu sach, dien sach, te sach
nang can » nang ban, nang cai, nang cau
nang cap » nang cham, nang phap, hang ca
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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 cao) or (((nang can) OR (nang cap)))) nhung cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh ((nang cao) OR (((nang can) OR (nang cap)))) nhung cong dan than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh ((nang cao) or (((nang can) OR (nang cap)))) nhung cong dan than ban".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh ((nang cao) or (((nang can) OR (nang cap)))) nhung cong dan than ban*.