Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, sach danh
nganh cong » nhanh chong, thanh cong
cac nganh » hoc nganh
cong thai » cong hai, hong thai, cong thanh
su sach » so sach, vu sach
vu cac » va cac, tu cac, ve cac
y khi » ly khi, ky khi, my khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vu cac nganh y khi đong luc ) or ( su sach nganh cong thai đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu cac nganh y khi đong luc ) OR ( su sach nganh cong thai đong luc ))*.