Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
ma hoi » mai hoi, xa hoi, me hoi
di cua » dai cua, de cua, do cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((ma hoi) OR (ma hoa)). hieu qua cac duc va hanh ((di cua) OR (doi cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((ma hoi) or (ma hoa)). hieu qua cac duc va hanh ((di cua) OR (doi cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((ma hoi) or (ma hoa)). hieu qua cac duc va hanh ((di cua) OR (doi cua)) triet*.