Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach ty, sach kem
vai cau » va cau, van cau, vai cac
hieu va » lieu va, hieu qua
ma hoi » mai hoi, ma hoa, me hoi
cac co » cac cong
co van » cao van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach y)) nang ((ma hoi) or (xa hoi)). hieu va cac co van hanh vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ((ma hoi) OR (xa hoi)). hieu va cac co van hanh vai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) nang ((ma hoi) or (xa hoi)). hieu va cac co van hanh vai cau treo".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) nang ((ma hoi) or (xa hoi)). hieu va cac co van hanh vai cau treo*.