Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh do » thanh de, thanh pho, thanh hoa
thanh di » thanh doi, thanh de, thanh dinh
pham duy » pham duc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach tu » sach thu, cach tu, sach ty
duy va » duy vat, duy van, day va

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 tu) or (sach y)) nang xa hoi. hieu ve pham duy va ((thanh di) OR (thanh do)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach y)) nang xa hoi. hieu ve pham duy va ((thanh di) OR (thanh do)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach y)) nang xa hoi. hieu ve pham duy va ((thanh di) OR (thanh do)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach y)) nang xa hoi. hieu ve pham duy va ((thanh di) OR (thanh do)) su triet*.