Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, nam thuc, dam thuc
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va
sai ky » sac ky
cam tu » cam thu, nam tu, dam tu
ma hoi » mai hoi, xa hoi, ma hoa
te sai » te tai, te bai, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang ma hoi. ((hieu ve) OR (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 sai ky nang ma hoi. ((hieu ve) OR (hieu van)) ((cam tuc) OR (cam tu)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang ma hoi. ((hieu ve) OR (hieu van)) ((cam tuc) or (cam tu)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang ma hoi. ((hieu ve) OR (hieu van)) ((cam tuc) or (cam tu)) va hanh dai cua tre*.