Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
chat soc » cham soc, chat hoc, chat doc
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
sach ky » sac ky, sach y, sach ty
soc van » hoc van, oc van, sac van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
bo sach » co sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky ((nang xa) or (lang xa)) hoi. hieu ve chat soc van thanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((nang xa) OR (lang xa)) hoi. hieu ve chat soc van thanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((nang xa) or (lang xa)) hoi. hieu ve chat soc van thanh vi ((cua tre) or (cau tren))*.