Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh doi » danh di, thanh doi, dung doi
van hac » van hoc, van ha, van hai
doi cua » dai cua, hoi cua
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
van bac » van ban, van bao, dan bac
ty nang » ky nang, ty hang, ly nang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((van bac) or (van hac)) thuc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((van bac) OR (van hac)) thuc va danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((van bac) or (van hac)) thuc va danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((van bac) or (van hac)) thuc va danh doi cua tre*.