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