Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
cam tuc » cam xuc, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang ma) or (lang xa)) hoi. hieu van ((cam tuc) or (cam tu)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang ma) OR (lang xa)) hoi. hieu van ((cam tuc) OR (cam tu)) va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang ma) or (lang xa)) hoi. hieu van ((cam tuc) or (cam tu)) va hanh dai cua tre*.