Perhaps you should try some spelling variations:
dang thi » hoang thi, dang khoi
su sach » so sach, vu sach
cac dac » cac dan, cac dai, cac bac
thi cua » thai cua, thi cuc, tri cua
va dang » van dang, va nang, va lang
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
cac tu » cac thu, cach tu, cac du

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) or (lieu va)) ((cac tu) or (cac dac)) va dang thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. ((hieu va) OR (lieu va)) ((cac tu) OR (cac dac)) va dang thi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. ((hieu va) or (lieu va)) ((cac tu) or (cac dac)) va dang thi cua tre*.