Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
sach nganh » sach tranh, cac nganh, sach danh
sach ngan » sach ngon, sach nha, sach han
cong thai » hong thai, cong thanh, cong tac
cong hai » cong ha, hoang hai, cong tac
cong khi » khong khi, co khi, cong ha
te sach » toc sach
tu sach » thu sach, su sach, tu cach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach ngan ((cong thai) OR (cong hai)) đong luc ) or ( tu sach nganh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach ngan ((cong thai) OR (cong hai)) đong luc ) OR ( tu sach nganh cong khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach ngan ((cong thai) OR (cong hai)) đong luc ) or ( tu sach nganh cong khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach ngan ((cong thai) OR (cong hai)) đong luc ) or ( tu sach nganh cong khi đong luc ))*.