Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
ca hoi » cau hoi, cua hoi, xa hoi

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) or (hoc sach)) ty hang ca hoi. hieu va cac tuc va ((hanh vai) or (thanh tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ty hang ca hoi. hieu va cac tuc va ((hanh vai) OR (thanh tai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ty hang ca hoi. hieu va cac tuc va ((hanh vai) or (thanh tai)) cuu tre*.