Perhaps you should try some spelling variations:
tap hanh » tap thanh, tap hinh, tap danh
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cac toi » cac thoi
toi tap » toi gap, toan tap, tong tap
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
vu san » va san, vu ban
tu ban » thu ban, 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: ((vu san) OR (tu ban)) ky nang cao hoi. hieu va cac toi tap hanh ((vai cua) OR (lai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu san) or (tu ban)) ky nang cao hoi. hieu va cac toi tap hanh ((vai cua) OR (lai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((vu san) or (tu ban)) ky nang cao hoi. hieu va cac toi tap hanh ((vai cua) OR (lai cua)) tre*.