Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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 (nang x)) hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang x)) hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang x)) hoi. hieu ve cam ((tuc va) OR (tuc xa)) thanh vi cua triet*.