Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
cac nganh » hoc nganh
cong khi » cong thai, khong khi, co khi
vu sach » vu bach, vu khach
su sach » so sach
su cac » tu cac, su cao, su can
han y » nhan y, han 2, han 1
y khi » ly khi, ky khi, my 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: (( su cac nganh cong khi đong luc ) OR ( ((vu sach) OR (su sach)) han y khi đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su cac nganh cong khi đong luc ) or ( ((vu sach) OR (su sach)) han y khi đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( su cac nganh cong khi đong luc ) or ( ((vu sach) OR (su sach)) han y khi đong luc ))*.