Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu san » thu san, tu ban, vu san
tu can » tu ban, tu cac, thu canh
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua

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

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