Perhaps you should try some spelling variations:
sach minh » sach kinh, sach danh, sac tinh
cac nganh » hoc nganh
minh cong » minh cuong, sinh cong, minh hoang
su sach » so sach, vu sach
cong ha » cong hoa, dong ha, cong tac
su cac » tu cac, su cao, su can
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: (( su cac nganh y khi đong luc ) or ( su sach minh cong ha đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su cac nganh y khi đong luc ) OR ( su sach minh cong ha đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( su cac nganh y khi đong luc ) or ( su sach minh cong ha đong luc ))*.