Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh duc » thach duc, than duc, thinh duc
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
tu sac » tu sach, tu cac, tu bac
tu san » thu san, tu ban, tu can
x hoi » xa hoi, o hoi, x ho
hoa » khoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) OR (tu san)) ky nang x hoi. hieu va thanh duc ((van ban) or (van thanh)) van hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang x hoi. hieu va thanh duc ((van ban) OR (van thanh)) van hoa viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu san)) ky nang x hoi. hieu va thanh duc ((van ban) or (van thanh)) van hoa viet*".