Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
tu chung » tu vung, tu cong
te sach » toc sach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cho hoc » co hoc, khoa hoc
tu hanh » du hanh, lu hanh, thuc hanh
tu hang » thu hang, tu hung, ty hang
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 hang) OR (tu hanh))) or (tu chung)) cho hoc. hieu vien cac xuc van hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((tu hang) OR (tu hanh))) OR (tu chung)) cho hoc. hieu vien cac xuc van hanh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((tu hang) OR (tu hanh))) or (tu chung)) cho hoc. hieu vien cac xuc van hanh vi cua cay*".