Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
sach thu » sach thue, sach thieu, sach tham
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
nang ma » tang ma, sang ma, nang cao
su hien » su kien, su tien, thu hien
nang xa » nang x, lang xa, mang xa
tuc va » thuc va, truc va, tuc xa
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cac tuc va thanh tai su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cac tuc va thanh tai su hien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cac tuc va thanh tai su hien*".