Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
xuc van » duc van, luc van, vuc van
hieu va » hieu qua
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((lang xa) or (lang ha)) hoi. ((hieu va) or (lieu va)) chat xuc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((lang xa) OR (lang ha)) hoi. ((hieu va) OR (lieu va)) chat xuc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((lang xa) or (lang ha)) hoi. ((hieu va) or (lieu va)) chat xuc van hanh dai cua tre*.