Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
van chat » cao chat
uu nang » cuu nang, vu nang, cuu nong
va chat » va phat, cao chat, hoa chat
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
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: ((toc sach) OR (hoc sach)) uu nang x hoi. lieu ((va chat) or (van chat)) xuc va dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) uu nang x hoi. lieu ((va chat) OR (van chat)) xuc va dan dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) uu nang x hoi. lieu ((va chat) or (van chat)) xuc va dan dai cua tre*".