Perhaps you should try some spelling variations:
pham duy » pham duc
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve pham » vi pham, v pham, ve phan
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
duy va » duy vat, duy van, day va
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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