Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
cao hoc » co hoc, cho hoc, chat hoc
cua cay » cua 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 tu nang cao hoc. ((hieu van) OR (lieu va)) ((coc luc) or (hoc nuoc)) van hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang cao hoc. ((hieu van) OR (lieu va)) ((coc luc) OR (hoc nuoc)) van hanh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang cao hoc. ((hieu van) OR (lieu va)) ((coc luc) or (hoc nuoc)) van hanh vi cua cay*".