Perhaps you should try some spelling variations:
pham duy » pham duc
sach thu » sach thue, sach thieu, sach tham
vu sach » vu bach, su sach, vu khach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
lang ha » long ha
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: vu sach thu ((nang xa) or (lang ha)) hoi. hieu va pham duy va tinh di ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((nang xa) OR (lang ha)) hoi. hieu va pham duy va tinh di ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thu ((nang xa) or (lang ha)) hoi. hieu va pham duy va tinh di ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: vu sach thu ((nang xa) or (lang ha)) hoi. hieu va pham duy va tinh di ((cua te) OR (cua tu))*.