Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh mai » hanh ma, hanh mau, hanh may
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
vu cham » va cham, vu kham, tu cham
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) OR (ty xang)) ma hoi. hieu ((vu cham) or (ve chat)) duc va hanh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) ma hoi. hieu ((vu cham) OR (ve chat)) duc va hanh mai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) ma hoi. hieu ((vu cham) or (ve chat)) duc va hanh mai va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) ma hoi. hieu ((vu cham) or (ve chat)) duc va hanh mai va triet*.