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 vat
nang xa » nang x, lang xa, nang ma
sac ky » sai ky
va ban » van ban, va bai, va bao

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

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