Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
thai cua » than cua, tai cuc, tri cua
tai cua » tai cuc, tri cua, dai cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
bai ky » ban ky, sai ky, bac ky
te bai » te bao, te tai, te ban

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 bai ky lang ha noi. hieu va cham duc ((va hanh) OR (va danh)) ((tai cua) OR (thai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky lang ha noi. hieu va cham duc ((va hanh) or (va danh)) ((tai cua) OR (thai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te bai ky lang ha noi. hieu va cham duc ((va hanh) or (va danh)) ((tai cua) OR (thai cua)) tre*.