Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
nganh cong » nhanh chong, thanh cong
sach nhanh » cach nhanh, sach nha, sach tranh
chong khi » khong khi, chong hiv, chong li
chong lai » chong li, chong mai, cong lai
cong khi » cong thai, khong khi, co khi
su sach » so sach, vu sach

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

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