Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, hieu ve
hanh lam » thanh lap, hanh kem, hanh va
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
chu duc » thu duc, chua duoc, cuu duoc
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
lam su » lai su, lam so, lam vu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach ty)) nang o hoi. ((hieu van) or (lieu va)) chu duc va hanh lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang o hoi. ((hieu van) OR (lieu va)) chu duc va hanh lam su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang o hoi. ((hieu van) or (lieu va)) chu duc va hanh lam su triet*.