Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
nam duoc » nam thuoc, da duoc, dat duoc
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
nang xa » lang xa, nang ma, mang xa
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
cua te » cua tu

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 ly ((nang xa) OR (nang x)) hoi. hieu va ((nam duoc) or (cao duc)) van thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly ((nang xa) OR (nang x)) hoi. hieu va ((nam duoc) OR (cao duc)) van thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly ((nang xa) OR (nang x)) hoi. hieu va ((nam duoc) or (cao duc)) van thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ly ((nang xa) OR (nang x)) hoi. hieu va ((nam duoc) or (cao duc)) van thanh tai cua te*.