Perhaps you should try some spelling variations:
chanh niem » thanh liem, thanh nien
thien van » thi van
va chanh » va thanh, va chinh, va hanh
niem cua » nhiem cua, niem chua, diem cua
cham cuu » cap cuu, chat cua
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang
ky danh » ky anh
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
cuu va » cuu van, cuu ve

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) OR (ky danh)) mai hoi. ((hieu ve) or (thien 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) OR (ky danh)) mai hoi. ((hieu ve) OR (thien van)) cham cuu va chanh niem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky dang) OR (ky danh)) mai hoi. ((hieu ve) or (thien van)) cham cuu va chanh niem cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky dang) OR (ky danh)) mai hoi. ((hieu ve) or (thien van)) cham cuu va chanh niem cua tre*.