Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang van » hoang van, hang va
ban hanh » ban hang
doc sach » hoc sach, toc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
cau cuc » cau cua, cau luc, cau truc
cuc ban » cua ban, cac ban, cuu ban
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y ((lang xa) or (dang van)) hoi. hieu van cau cuc ban hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y ((lang xa) OR (dang van)) hoi. hieu van cau cuc ban hanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: doc sach y ((lang xa) or (dang van)) hoi. hieu van cau cuc ban hanh vi ((cua tre) or (cua triet))*.