Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cac tac » cac toc, cac bac, cac dac
cua tre » cuu tre, cua triet, dua tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dan thi » dang thi, tran thi, dinh thi
va dan » ca dan, va dao, va dau
cua te » cua tu
sach v » sach va, sach y, sach 2
cac tu » cac thu, cach tu, cac du
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 tu) or (cac tac)) va dan thi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu va ((cac tu) OR (cac tac)) va dan thi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu va ((cac tu) or (cac tac)) va dan thi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu va ((cac tu) or (cac tac)) va dan thi ((cua tre) OR (cua te))*.