Perhaps you should try some spelling variations:
chanh niem » thanh liem, thanh nien
va chanh » va thanh, va chinh, va hanh
dang mai » dang hai, dang mau, dang bai
niem cua » nhiem cua, niem chua, diem cua
hieu van » hieu va, thien van, lieu va
cham cuu » cap cuu, chat cua
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va
te sac » te sach, te cac, te san
cuu va » cuu van, cuu ve
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: te sac ky dang mai hoi. ((hieu ve) or (hieu van)) cham cuu va chanh niem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang mai hoi. ((hieu ve) OR (hieu van)) cham cuu va chanh niem cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky dang mai hoi. ((hieu ve) or (hieu van)) cham cuu va chanh niem cua tre*.