Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau triet
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
di cau » da cau, diem cau
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((x ho) or (xa hoi)). hieu ve am thuc ((va hanh) OR (va thanh)) di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((x ho) OR (xa hoi)). hieu ve am thuc ((va hanh) OR (va thanh)) di cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((x ho) or (xa hoi)). hieu ve am thuc ((va hanh) OR (va thanh)) di cau treo".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((x ho) or (xa hoi)). hieu ve am thuc ((va hanh) OR (va thanh)) di cau treo*.