Perhaps you should try some spelling variations:
thien va » thien van, tien va, thien tai
cham hoc » cham soc, chat hoc, cham hoi
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
hoi cua » hoi chuc
te sai » te tai, te bai, te lai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang ((cao hoi) OR (cao hoc)). thien va cham hoc va hanh ((lai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang ((cao hoi) OR (cao hoc)). thien va cham hoc va hanh ((lai cua) OR (hoi cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang ((cao hoi) OR (cao hoc)). thien va cham hoc va hanh ((lai cua) or (hoi cua)) tre*".