Perhaps you should try some spelling variations:
ve triet » va trien, su triet
cua viet » ca viet, hoa viet, cua vat
hanh lai » hanh lam, hanh tai, thanh lap
sach tu » sach thu, cach tu, sach ty
va hanh » van hanh, va thanh, va danh
chao su » cao su, chao xu, achat su
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai
su va » su van, tu va

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 o hai. hieu ve chao su va hanh lai ((cua viet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach y)) nang o hai. hieu ve chao su va hanh lai ((cua viet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach y)) nang o hai. hieu ve chao su va hanh lai ((cua viet) or (ve triet))*.