Perhaps you should try some spelling variations:
cau truong » cac truong, cao truong, xa truong
thien van » thi van
thuat dan » thuat san, thuat ban, thuat dam
van cau » van dau, van hau, van chat
tu nano » truc nano
va hanh » van hanh, va thanh, va danh
su hien » su kien, su tien, thu hien
nano o » nano 1, nano cuo, nano mot
dan tu » danh tu, dan su, ban tu
va dan » ca dan, va dao, va dau
vai su » va su, van su, lai su
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: thuat dan tu nano o hoi. thien van cau truong ((va hanh) or (va dan)) vai su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat dan tu nano o hoi. thien van cau truong ((va hanh) OR (va dan)) vai su hien.
• Adding a wildcard symbol may retrieve word variants: thuat dan tu nano o hoi. thien van cau truong ((va hanh) or (va dan)) vai su hien*.