Perhaps you should try some spelling variations:
qua than » qua thanh, qua phan, qua tan
than duc » tran duc, phan duc, than doc
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va danh, ban hanh
thai va » thai van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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 sac ky lang xa hoi. hieu qua than duc ((va hanh) OR (va thanh)) ((thai va) OR (tri va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. hieu qua than duc ((va hanh) OR (va thanh)) ((thai va) or (tri va)) triet~".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. hieu qua than duc ((va hanh) OR (va thanh)) ((thai va) or (tri va)) triet*.