Perhaps you should try some spelling variations:
pham sach » pham anh, nam sach, pham hanh
van hanh » van thanh, ban hanh, van anh
sach van » sach han, sach va, bach van
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
lang ha » long ha
lang xa » dang xay, lang van
cua te » cua 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 (lang ha)) hoi. hieu vu pham sach van hanh di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (lang ha)) hoi. hieu vu pham sach van hanh di ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (lang ha)) hoi. hieu vu pham sach van hanh di ((cua tre) or (cua te))*.