Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
su tren » su tien, tu tren, cu tren
y nang » ly nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
va cap » va cac, va dap, va cai
va cao » va cac, va co, va dao
cuu va » cuu van, cuu ve
ve su » va su

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) or (ky nang)) ma hoi. lieu ((va cap) OR (va cao)) cuu va hanh ve su tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (ky nang)) ma hoi. lieu ((va cap) OR (va cao)) cuu va hanh ve su tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) or (ky nang)) ma hoi. lieu ((va cap) OR (va cao)) cuu va hanh ve su tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (ky nang)) ma hoi. lieu ((va cap) OR (va cao)) cuu va hanh ve su tren*.