Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
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 ((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 ((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 ((cua viet) OR (cua vat))*.