Perhaps you should try some spelling variations:
ban hanh » ban hang
toc sach » hoc sach, doc sach, thuoc sach
ngan cho » ngang cho, ngang tho, nganh che
vien cac » vien bach, vien dai, vien da
vuc ban » vu ban, duc ban, cuc ban
cho hoc » co hoc, khoa hoc
ly ngan » ly nhan
cua cay » cua cac
ve cac » va 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) OR (toc sach)) ly ngan cho hoc. hieu ((ve cac) or (vien cac)) vuc ban hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly ngan cho hoc. hieu ((ve cac) OR (vien cac)) vuc ban hanh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ly ngan cho hoc. hieu ((ve cac) or (vien cac)) vuc ban hanh vi cua cay*".