Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
van bac » van ban, van bao, van bau
dan bac » dan ba, dong bac, gian bac
van hac » van hoc, van ha, van hai
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang cao hoi. hieu ((((van bac) or (dan bac))) or (van hac)) truc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang cao hoi. hieu ((((van bac) OR (dan bac))) OR (van hac)) truc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. hieu ((((van bac) or (dan bac))) or (van hac)) truc va danh di cua tre*.