Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cac » van bac, dan cac, van ca
van cau » van dau, van hau, van chat
van hac » van hoc, van ha, van hai
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
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: tu sach ky nang xa hoi. hieu ((((van cac) OR (van cau))) or (van hac)) truc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((((van cac) OR (van cau))) OR (van hac)) truc va danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((((van cac) OR (van cau))) or (van hac)) truc va danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((((van cac) OR (van cau))) or (van hac)) truc va danh doi cua tre*.