Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
bo sach » co sach, hoc sach
cua tre » cua te, cua triet, dua tren
chat oc » chat hoc, chat doc, chat hoa
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
cuu tre » cau tren, cau treo
oc van » hoc van, luoc van, quoc van

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 ((mang xa) or (lang xa)) hoi. hieu ve chat oc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((mang xa) OR (lang xa)) hoi. hieu ve chat oc van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((mang xa) or (lang xa)) hoi. hieu ve chat oc van hanh vi ((cua tre) or (cuu tre))*.