Perhaps you should try some spelling variations:
sach ngang » sach nang, sach ngan, sach ngon
sach nganh » sach ngan, sach tranh, cac nganh
ngang cao » nang cao, ngang cho, quang cao
su sach » so sach
vu sach » vu bach, vu khach
cao tai » cao tang
ky khi » ky thi
ly khi » ly chi

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 sach nganh ((ky khi) OR (ly khi)) đong luc ) OR ( vu sach ngang cao tai đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach nganh ((ky khi) OR (ly khi)) đong luc ) or ( vu sach ngang cao tai đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( su sach nganh ((ky khi) OR (ly khi)) đong luc ) or ( vu sach ngang cao tai đong luc ))*.