Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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 hoi. hieu ((ve cam) or (ve cac)) luc va hanh vi ((cau tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang xa hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vi ((cau tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang xa hoi. hieu ((ve cam) or (ve cac)) luc va hanh vi ((cau tren) or (cua tre))*.