Perhaps you should try some spelling variations:
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
dan hai » doan hai, dang hai, dan khai
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
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: te sach ((ty hang) or (ky nang)) x hoi. hieu va pham duc va dan hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (ky nang)) x hoi. hieu va pham duc va dan hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (ky nang)) x hoi. hieu va pham duc va dan hai cua tre*.