Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
van lam » van nam
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » tuc va, luc va, xac va
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: tu ((sach y) or (sac ky)) tang ma hoi. hieu van lam ((xuc va) OR (duc va)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) tang ma hoi. hieu van lam ((xuc va) OR (duc va)) thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sac ky)) tang ma hoi. hieu van lam ((xuc va) OR (duc va)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) tang ma hoi. hieu van lam ((xuc va) OR (duc va)) thanh vai cua tre*.