Perhaps you should try some spelling variations:
thanh nam » hanh nam, thanh tam, thanh pham
thanh dam » thanh dat, thanh tam, thanh lam
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach
ly nang » ky nang, ly hang, ly vang
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (so sach)) ly nang cao hoi. hieu ve cau luc va ((thanh dam) OR (thanh nam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (so sach)) ly nang cao hoi. hieu ve cau luc va ((thanh dam) OR (thanh nam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu bach) or (so sach)) ly nang cao hoi. hieu ve cau luc va ((thanh dam) OR (thanh nam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (so sach)) ly nang cao hoi. hieu ve cau luc va ((thanh dam) OR (thanh nam)) cua tre*.