Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hieu van » hieu va, thien van, lieu va
xa thanh » va thanh, ha thanh, ta thanh
su sach » so sach
cua tre » cua te, cua triet, dua tren
cac tuc » cac toc, cac tu, cac tac
van cac » van hac, van cau, van bac
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky nang ma hoi. hieu van cac tuc xa thanh doi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ma hoi. hieu van cac tuc xa thanh doi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang ma hoi. hieu van cac tuc xa thanh doi ((cua tre) or (cuu tre))*.