Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh sai » dung sai, danh bat, danh dau
danh dai » danh dau, danh di, vanh dai
truc va » thuc va, thuc vat, trung va
cao cap » cao chat
sach ky » sac ky, sach y, sach ty
cao cau » co cau, tao cau, ca cau
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ((cao cau) or (cao cap)) truc va ((danh dai) OR (danh sai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((cao cau) OR (cao cap)) truc va ((danh dai) OR (danh sai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ((cao cau) or (cao cap)) truc va ((danh dai) OR (danh sai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((cao cau) or (cao cap)) truc va ((danh dai) OR (danh sai)) cuu tre*.