Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
cua triet » cua viet, su triet, va triet
viec dao » viec bao, viec dat, viet dao
toc sach » hoc sach, doc sach, thuoc sach
lang xa » dang xay, lang van
lang ha » long ha
sach ky » sac ky, sach y, sach ty
dao tuc » dao duc
tuc va » thuc va, truc va, tuc xa
va dau » va dao
dau vi » dau ve, dau va, dat vi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((lang xa) OR (lang ha)) hoi. nhieu viec dao tuc va dau vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang xa) OR (lang ha)) hoi. nhieu viec dao tuc va dau vi cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) OR (lang ha)) hoi. nhieu viec dao tuc va dau vi cua triet*.