Perhaps you should try some spelling variations:
anh thang » danh thang, manh thang, anh thong
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van giao » nang giao, toan giao, dan gian
thang di » hang di, tang di, thang loi
su triet » su viet, su tien
ve triet » va trien
xang xa » lang xa, mang xa, ang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ty xang xa hoi. hieu van giao duc anh thang di ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty xang xa hoi. hieu van giao duc anh thang di ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty xang xa hoi. hieu van giao duc anh thang di ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty xang xa hoi. hieu van giao duc anh thang di ((su triet) OR (ve triet))*.