Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
va tham » van tham, va thanh, va thuat
hanh va » hang va, hanh vi
coc ban » co ban, cac ban, hoc ban
va cham » va chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vu khac » vu kham, vu khanh, bui khac
va hoa » van hoa, va hoc, ma hoa

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) or (vu khac)) ky lang xa hoi. hieu ((va cham) OR (va tham)) coc ban hanh va hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu khac)) ky lang xa hoi. hieu ((va cham) OR (va tham)) coc ban hanh va hoa viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu khac)) ky lang xa hoi. hieu ((va cham) OR (va tham)) coc ban hanh va hoa viet*".