Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
pham duy » pham duc
tinh ve » trinh ve, tinh ven, dinh ve
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
duy va » duy vat, duy van, day va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. ((hieu ve) or (hieu van)) pham duy va tinh ve ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu ve) OR (hieu van)) pham duy va tinh ve ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu ve) or (hieu van)) pham duy va tinh ve ((cua te) OR (cua tu))*".