Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh ca » hanh cac, hanh cat, hanh cua
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang xa) or (nang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) hanh ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (nang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) hanh ca cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang xa) or (nang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) hanh ca cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. hieu ve cam ((luc va) OR (duc va)) hanh ca cua triet*.