Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
cua tre » cua te, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
van bac » van ban, van bao, van hac
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty mang xa hoi. hieu ((van bac) or (van cau)) duc van hanh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty mang xa hoi. hieu ((van bac) OR (van cau)) duc van hanh vai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ty mang xa hoi. hieu ((van bac) or (van cau)) duc van hanh vai ((cua tre) or (cuu tre))*.