Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van hanh » van thanh, ban hanh, van ban
cua tre » cua te, cuu tre, cua triet
van anh » van thanh, tuan anh, van minh
ky lang » ky nang, ky dang, tay lang
vai cua » dai cua, hai cua, lai cua
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
tu sai » tu bai, tu san, tu cai
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ((ky lang) OR (ky tang)) van hoa. hieu ve cac nuoc ((van hanh) or (van anh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ((ky lang) OR (ky tang)) van hoa. hieu ve cac nuoc ((van hanh) OR (van anh)) vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ((ky lang) OR (ky tang)) van hoa. hieu ve cac nuoc ((van hanh) or (van anh)) vai cua tre*".