Perhaps you should try some spelling variations:
thanh vai » thanh van, thanh tai, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua dieu
te cac » tu cac, ve cac, te cao
va ban » van ban, va bai, va bao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky nang x hoi. hieu van nam va ban ((thanh vai) OR (thanh hai)) ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky nang x hoi. hieu van nam va ban ((thanh vai) OR (thanh hai)) ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky nang x hoi. hieu van nam va ban ((thanh vai) OR (thanh hai)) ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: te cac ky nang x hoi. hieu van nam va ban ((thanh vai) OR (thanh hai)) ((cua viet) or (cua vat))*.