Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
te sach » toc sach
van anh » van thanh, tuan anh, van minh
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
tu nano » truc nano
cu lang » cua lang, tu lang, xu lang
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((cu lang) or (tu nano)) cho hoc. hieu ve cac luc ((van hanh) OR (van anh)) vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((cu lang) OR (tu nano)) cho hoc. hieu ve cac luc ((van hanh) OR (van anh)) vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((cu lang) or (tu nano)) cho hoc. hieu ve cac luc ((van hanh) OR (van anh)) vi cua cau*".