Perhaps you should try some spelling variations:
cach nhanh » cac nhan, cac thanh
sach ngan » sach ngon, sach nha, sach han
cac nganh » hoc nganh
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, su sach, te sach
ngan ky » nganh ky, nhan ky, ngan hay
ky khi » ky thi, ly khi

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 ngan ky khi đong luc ) or ( tu ((cach nhanh) or (cac nganh)) cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ngan ky khi đong luc ) OR ( tu ((cach nhanh) OR (cac nganh)) cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ngan ky khi đong luc ) or ( tu ((cach nhanh) or (cac nganh)) cong khi đong luc ))*.