Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
luc va » duc va, tuc va, loc va

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 y ((nang xa) or (dang xay)) hoi. hieu van cau luc va hanh tai ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (dang xay)) hoi. hieu van cau luc va hanh tai ((va triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (dang xay)) hoi. hieu van cau luc va hanh tai ((va triet) or (ve triet))*.