Perhaps you should try some spelling variations:
pham duy » pham duc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
duy va » duy vat, duy van, day va
va chu » va che, va cau, va chi
chu te » chu de, chu tu

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 ty ((lang xa) or (nang x)) hoi. hieu vu pham duy va tinh va chu te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (nang x)) hoi. hieu vu pham duy va tinh va chu te.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (nang x)) hoi. hieu vu pham duy va tinh va chu te*.