Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van tuan » van quan, van ban, anh tuan
tuan san » luan san, tan san, thanh san
dua tren » dung tren
su sach » so sach, vu sach
hieu vo » hieu voi, hieu va, hieu ve
xua van » xua va, qua van, cua van
y nang » ky nang, ly nang, v nang
co xua » co cua, bo xua, cao xuan
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu vo co xua van tuan san ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu vo co xua van tuan san ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu vo co xua van tuan san ((dua tren) or (cua triet))*.