Perhaps you should try some spelling variations:
te sach » toc sach
kv nang » ky nang, ki nang, ke nang
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
van vat » van chat, nhan vat
vat cua » mat cua, bat cua, dat cua
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
tac va » tac da, tac xa, tuc va
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 ((v nang) or (kv nang)) x hoi. hieu va cac tac va van vat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (kv nang)) x hoi. hieu va cac tac va van vat cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) or (kv nang)) x hoi. hieu va cac tac va van vat cua tre*.