Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ke thang » ke trang, le thang, ke thuong
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
ke phan » ve phan, kenh phan
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
so viet » hoc viet
vi so » vi soi, vi mo, va so

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty hang) or (ly hang)) xa hoi. hieu ((ke phan) or (ke thang)) duc van hanh vi so viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ly hang)) xa hoi. hieu ((ke phan) OR (ke thang)) duc van hanh vi so viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) or (ly hang)) xa hoi. hieu ((ke phan) or (ke thang)) duc van hanh vi so viet*.