Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
xu va » xu van, tu va, su va
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 tu) or (sach y)) nang x hoi. hieu ve chao xu va hanh lai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach y)) nang x hoi. hieu ve chao xu va hanh lai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) or (sach y)) nang x hoi. hieu ve chao xu va hanh lai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach y)) nang x hoi. hieu ve chao xu va hanh lai ((cua triet) OR (su triet))*.