Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang ((ma hoi) OR (ma hoa)). lieu ((va cam) or (va cao)) duc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((ma hoi) OR (ma hoa)). lieu ((va cam) OR (va cao)) duc van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ((ma hoi) OR (ma hoa)). lieu ((va cam) or (va cao)) duc van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((ma hoi) OR (ma hoa)). lieu ((va cam) or (va cao)) duc van hanh vi cua te*.