Perhaps you should try some spelling variations:
duong sach » duong manh
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
ty nang » ky nang, ty hang, ly nang
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: duong sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cam tuc va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: duong sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cam tuc va hanh vi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "duong sach ((ty nang) OR (ty xang)) xa hoi. hieu ve cam tuc va hanh vi ((cua tre) or (cuu tre))*".