Perhaps you should try some spelling variations:
van phan » van phong, van thanh, luan phan
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
phan duc » pham duc, phan tu, phan dau
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
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 xa) or (lang xa)) hoi. hieu van phan duc va ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((nang xa) OR (lang xa)) hoi. hieu van phan duc va ((hanh vai) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (lang xa)) hoi. hieu van phan duc va ((hanh vai) or (hanh va)) cua tre*.