Perhaps you should try some spelling variations:
cham doc » cham soc, chat doc, chau doc
tu sach » thu sach, su sach, te sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va dinh » van dinh, va kinh, va tinh
vai cua » hai cua, lai cua, bai cua
doc va » duoc va, hoc va, duc va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang xa)) hoi. hieu ve cham doc va dinh ((vai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (lang xa)) hoi. hieu ve cham doc va dinh ((vai cua) or (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (lang xa)) hoi. hieu ve cham doc va dinh ((vai cua) or (dai cua)) tre*.