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