Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
nam tuc » nam thuc, nam truc, nam tu
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky

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 ty) or (sac ky)) nang ma hoi. hieu van nam tuc xa ((hanh vai) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sac ky)) nang ma hoi. hieu van nam tuc xa ((hanh vai) OR (hanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sac ky)) nang ma hoi. hieu van nam tuc xa ((hanh vai) or (hanh va)) cuu tre*.