Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cac toc » cac toi, cac nuoc, cac thoi
thi cua » thai cua, thi cuc, tri cua
dan thi » dang thi, tran thi, dinh thi
cac tac » cac bac, cac dac, cac tai
cua tre » cua te, cuu tre, cua triet
cac tuc » cac tu, cac nuoc, cac cuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
va dan » ca dan, va dao, va dau
v nang » va nang, vu nang, van nang

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 v nang xa hoi. hieu va ((((cac tuc) OR (cac toc))) or (cac tac)) va dan thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu va ((((cac tuc) OR (cac toc))) OR (cac tac)) va dan thi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu va ((((cac tuc) OR (cac toc))) or (cac tac)) va dan thi cua tre*".