Perhaps you should try some spelling variations:
sach nganh » sach ngan, cac nganh, sach danh
nganh cong » nhanh chong, thanh cong
sach nhanh » cach nhanh, sach nha, sach danh
sach tranh » canh tranh
chong khi » khong khi, chong hiv, chong lai
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 nganh cong khi đong luc ) or ( tu ((sach nhanh) OR (sach tranh)) chong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach nganh cong khi đong luc ) OR ( tu ((sach nhanh) OR (sach tranh)) chong khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach nganh cong khi đong luc ) or ( tu ((sach nhanh) OR (sach tranh)) chong khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach nganh cong khi đong luc ) or ( tu ((sach nhanh) OR (sach tranh)) chong khi đong luc ))*.