Perhaps you should try some spelling variations:
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tac, cac nuoc
dau thi » cau thi, dan thi, dao thi
thi cuu » thi cuc, thi huu, thi cu
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
va dau » va dao

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) or (vu sach)) ky nang xa hoi. lieu va ((cac tuc) OR (cac tu)) va dau thi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. lieu va ((cac tuc) OR (cac tu)) va dau thi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang xa hoi. lieu va ((cac tuc) OR (cac tu)) va dau thi cuu tre*".