Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cuc viet » chuc viet, tuc viet, cua viet
hanh tai » hang tai, han tai, hinh tai
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
mang xa » lang xa, mang may, dang xay
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((mang xa) or (nang x)) hoi. hieu van cau tuc xa ((hanh tai) OR (thanh tai)) cuc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang xa) OR (nang x)) hoi. hieu van cau tuc xa ((hanh tai) OR (thanh tai)) cuc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((mang xa) or (nang x)) hoi. hieu van cau tuc xa ((hanh tai) OR (thanh tai)) cuc viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((mang xa) or (nang x)) hoi. hieu van cau tuc xa ((hanh tai) OR (thanh tai)) cuc viet*.