Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh vai » thanh hai, thanh tai, thanh oai
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
te sac » te sach, te cac
da ban » dia ban, dua ban, day ban
te san » te ban, ke san, tu san
nam da » nam dan, nam a, nam va

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