Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dua tren » dung tren
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, cua thep
cao xuc » cam xuc, cao duc, cao suc
xuc va » duc va, tuc va, luc va
sach v » sach va, sach y, sach 2
va cao » va cac, va co, va dao
v nang » va nang, vu nang, van nang
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach v nang x hoi. hieu va cao xuc va hanh vi ((((cua tre) OR (dua tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach v nang x hoi. hieu va cao xuc va hanh vi ((((cua tre) OR (dua tren))) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach v nang x hoi. hieu va cao xuc va hanh vi ((((cua tre) OR (dua tren))) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: hoc sach v nang x hoi. hieu va cao xuc va hanh vi ((((cua tre) OR (dua tren))) or (cua te))*.