Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
thu san » thuy san, thu ban, phu san
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
tu san » tu ban, tu can, vu san
ca duc » cao duc, cua duc, ha duc
ca dua » cay dua, ca cua, ca da

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 (thu san)) ky lang xa hoi. hieu qua ((ca duc) OR (ca dua)) van thanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (thu san)) ky lang xa hoi. hieu qua ((ca duc) OR (ca dua)) van thanh dai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (thu san)) ky lang xa hoi. hieu qua ((ca duc) OR (ca dua)) van thanh dai cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (thu san)) ky lang xa hoi. hieu qua ((ca duc) OR (ca dua)) van thanh dai cua vat*.