Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
lop va » lap va, hop va, nop va

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 ((ty nang) or (ky nang)) xa hoi. hieu va cac lop va hanh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ky nang)) xa hoi. hieu va cac lop va hanh vai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ky nang)) xa hoi. hieu va cac lop va hanh vai ((cua tre) or (cuu tre))*.