Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
de cua » le cua, te cua, dieu cua
te sai » te tai, te bai, te lai
sai ky » sac ky
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 sai ky nang x hoi. ((hieu ve) or (hieu va)) cam luc ((van hanh) OR (van thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang x hoi. ((hieu ve) OR (hieu va)) cam luc ((van hanh) OR (van thanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang x hoi. ((hieu ve) or (hieu va)) cam luc ((van hanh) OR (van thanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang x hoi. ((hieu ve) or (hieu va)) cam luc ((van hanh) OR (van thanh)) de cua tre*.