Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te cach » ve cach, te sach, tu cach
cach tu » cach thuc
tu danh » tu hanh, te danh, tu manh
cho hoc » co hoc, khoa hoc
duc van » duc va, duc tan, duc manh
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 cach tu danh cho hoc. hieu ((van dao) or (van ban)) duc van hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach tu danh cho hoc. hieu ((van dao) OR (van ban)) duc van hanh vi cua cay*.