Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach nay
cau phuc » cau truc, chau phu, huu phuc
phuc van » thuc van, phuc va, chuc van
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
vi cua » vai cua, di cua

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

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