Perhaps you should try some spelling variations:
sach nhanh » sach nha, sach tranh, sach danh
cach nhanh » cac nganh, cac nhan, cac thanh
sach nganh » sach ngan, sach tranh, cac nganh
nganh cong » nhanh chong, thanh cong
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, su sach, te sach

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

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