Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
sach ngan » sach ngon, sach nha, sach han
cau nganh » cac nganh, chuc nganh, cau danh
hang khi » hang khoa, dang khoi, khong khi
bang khi » ban khi, dang khoi, dang khai
cong khi » cong thai, khong khi, co khi
vu sach » vu bach, su sach, vu khach
tu cau » tu cac, cu cau, tu can

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 sach ngan ((hang khi) OR (bang khi)) đong luc ) OR ( tu cau nganh cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( vu sach ngan ((hang khi) or (bang khi)) đong luc ) or ( tu cau nganh cong khi đong luc ))*.