Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu 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. ((lieu va) or (hieu qua)) pham duc va hanh doi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((lieu va) OR (hieu qua)) pham duc va hanh doi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((lieu va) or (hieu qua)) pham duc va hanh doi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((lieu va) or (hieu qua)) pham duc va hanh doi ((cua tre) OR (cuu tre))*.