Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
can nganh » cau nganh, dang nganh, van ngan
cac nganh » hoc nganh
su sach » so sach, vu sach
trinh y » trinh ky, trinh ly, trinh _
hoa hi » hoa phi, hoa hoi, hoa thi
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 sach trinh y khi đong luc ) or ( tu ((can nganh) OR (cac nganh)) hoa hi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach trinh y khi đong luc ) OR ( tu ((can nganh) OR (cac nganh)) hoa hi đong luc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach trinh y khi đong luc ) or ( tu ((can nganh) OR (cac nganh)) hoa hi đong luc ))*".