Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
mai khoi » mai khoa, tai khoa, cac khoi
mai hoi » dai hoi, lai hoi, mai doi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
bat cau » bat dau, dat cau, ba cau
bat can » ban can
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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 ky nang ((mai hoi) or (mai khoi)). hieu va cam xuc va danh ((bat cau) OR (bat can)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((mai hoi) OR (mai khoi)). hieu va cam xuc va danh ((bat cau) OR (bat can)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((mai hoi) or (mai khoi)). hieu va cam xuc va danh ((bat cau) OR (bat can)) tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((mai hoi) or (mai khoi)). hieu va cam xuc va danh ((bat cau) OR (bat can)) tren*.