Perhaps you should try some spelling variations:
bach nganh » cac nganh, cach nhanh, sach ngan
nganh cong » nhanh chong, thanh cong
nganh ky » nganh y, nganh xay, hanh ky
cong khi » cong thai, khong khi, co khi
su sach » vu sach
so sach » so sanh, bo sach, co sach
ky khi » ky thi, ly khi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu bach nganh ky khi đong luc ) OR ( ((su sach) OR (so sach)) nganh cong khi đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( vu bach nganh ky khi đong luc ) or ( ((su sach) OR (so sach)) nganh cong khi đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( vu bach nganh ky khi đong luc ) or ( ((su sach) OR (so sach)) nganh cong khi đong luc ))*.