Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh ca » hanh cac, hanh cat, hanh cua
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
tuc va » truc va, tuc xa, duc 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: su ((sac ky) or (sach y)) nang cao hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach y)) nang cao hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh ca cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach y)) nang cao hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh ca cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach y)) nang cao hoi. hieu ve cam ((tuc va) OR (thuc va)) hanh ca cua triet*.