Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
van hanh » van thanh, ban hanh, van anh
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » va thanh, va danh, ban hanh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
te sai » te tai, te bai, te lai

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 lang) OR (ky nang)) xa hoi. hieu va cham cuu ((va hanh) or (van hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ((ky lang) OR (ky nang)) xa hoi. hieu va cham cuu ((va hanh) OR (van hanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ((ky lang) OR (ky nang)) xa hoi. hieu va cham cuu ((va hanh) or (van hanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sai ((ky lang) OR (ky nang)) xa hoi. hieu va cham cuu ((va hanh) or (van hanh)) tai cua tre*.