Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve 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
chat su » achat su, chat huu, chat cua
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
ve chat » va chat, van chat
ho hai » hoc hai, pho hai, cho hai
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 ho hai. hieu ve chat su va hanh lai ((cua viet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach y)) nang ho hai. hieu ve chat su va hanh lai ((cua viet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach y)) nang ho hai. hieu ve chat su va hanh lai ((cua viet) or (su triet))*.