Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau triet, cau trieu
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ve cac » va cac, vien cac

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: tu sai ky tang xa hoi. hieu ve cac du ((va hanh) OR (van hanh)) vi ((cau treo) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky tang xa hoi. hieu ve cac du ((va hanh) or (van hanh)) vi ((cau treo) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky tang xa hoi. hieu ve cac du ((va hanh) or (van hanh)) vi ((cau treo) OR (cau tren))*.