Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
cac duc » cao duc, cac dac, cac nuoc
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
cua cau » cua cac, cua chu, cua cay
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: thuoc sach ((tu nang) OR (tu nano)) cao hoc. hieu ve ((cac duc) or (cac du)) van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((tu nang) OR (tu nano)) cao hoc. hieu ve ((cac duc) OR (cac du)) van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((tu nang) OR (tu nano)) cao hoc. hieu ve ((cac duc) or (cac du)) van hanh vi cua cau*".