Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
dong cua » dung cua, cong cua, huong cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
nam tu » nam thu

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 ky nang ma hoi. hieu van ((nam thuc) or (nam tu)) va thanh dong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu van ((nam thuc) OR (nam tu)) va thanh dong cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu van ((nam thuc) or (nam tu)) va thanh dong cua tre*.