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

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