Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
nano cau » nang cau, bang cau, nano va
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
hieu ve » hieu van
tu nano » truc nano
bo sach » co sach, hoc sach
lai va » loai va, mai va, dai 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) or (bo sach)) tu nano cau hoi. ((hieu ve) or (hieu va)) cam xuc van hanh lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) tu nano cau hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh lai va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) tu nano cau hoi. ((hieu ve) or (hieu va)) cam xuc van hanh lai va triet*.