Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh vi » thanh va, thanh ve, nhanh vi
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
y xang » ty xang
ve cac » vien cac
xang x » nang x
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 xang x hoi. hieu ((ve cac) or (va cac)) truc va ((thanh vi) or (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y xang x hoi. hieu ((ve cac) OR (va cac)) truc va ((thanh vi) OR (hanh vi)) su triet.
• Adding a wildcard symbol may retrieve word variants: su sach y xang x hoi. hieu ((ve cac) or (va cac)) truc va ((thanh vi) or (hanh vi)) su triet*.