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

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