Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh ke » thanh ket, thanh ve, thanh de
sach tu » sach thu, cach tu, sach uu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach thu, xach tay
ve pham » vi pham, v pham, ve phan
duy va » duy van, day va, duy v
ke su » ke suu, ve su, ky 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 tu) or (sach ty)) nang xa hoi. hieu ve pham ((duy va) OR (duy vat)) thanh ke su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) nang xa hoi. hieu ve pham ((duy va) OR (duy vat)) thanh ke su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach ty)) nang xa hoi. hieu ve pham ((duy va) OR (duy vat)) thanh ke su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach ty)) nang xa hoi. hieu ve pham ((duy va) OR (duy vat)) thanh ke su triet*.