Perhaps you should try some spelling variations:
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
hieu de » hieu ve, hieu he, hieu le
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
de dat » de dao
vi cua » vai cua, di cua
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky ((nang ma) or (tang ma)) hoi. hieu de dat nuoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((nang ma) OR (tang ma)) hoi. hieu de dat nuoc va hanh vi cua tre*.