Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien, ve triet
tu cach » tu cac
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va ban » van ban, va bai, va bao
ban bo » can bo, ban do, ban co
bo van » vo van, so van, do van
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky nang ((x hoi) or (xa hoi)). hieu va ban bo van thanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang ((x hoi) OR (xa hoi)). hieu va ban bo van thanh va su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang ((x hoi) or (xa hoi)). hieu va ban bo van thanh va su triet*.