Perhaps you should try some spelling variations:
pham sach » pham anh, nam sach, pham hanh
van hanh » van thanh, ban hanh, van ban
dang xay » dang van, van xay
su sach » so sach, vu sach
van anh » van thanh, tuan anh, van minh
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 xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 (dang xay)) hoi. hieu vu pham sach ((van hanh) or (van anh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (dang xay)) hoi. hieu vu pham sach ((van hanh) OR (van anh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((lang xa) OR (dang xay)) hoi. hieu vu pham sach ((van hanh) or (van anh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) OR (dang xay)) hoi. hieu vu pham sach ((van hanh) or (van anh)) di cua tre*.