Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
va cham » va chat, va tham
ma hoi » mai hoi, xa hoi, me hoi
luc va » duc va, tuc va, loc va
va va » va van, va vua, va vai

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

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