Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, cua triet
anh di » danh di, xanh di, anh d
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu vu cham duc van anh di ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu vu cham duc van anh di ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu vu cham duc van anh di ((cua tre) or (cau tren))*.