Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
vien cac » vien bach, vien dai, vien da
toc sach » hoc sach, doc sach, thuoc sach
thu xang » thu hang, thu bang, thu dang
xang cho » sang cho, hang cho, tang cho
van hanh » van thanh, ban hanh, van ban
van anh » van thanh, tuan anh, van minh
cac xuc » cam xuc, cac nuoc, chat xuc
cho hoc » co hoc, khoa hoc
cua cay » cua cac
de cua » le cua, te cua, dieu 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)) thu xang cho hoc. hieu vien cac xuc ((van hanh) or (van anh)) de cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu xang cho hoc. hieu vien cac xuc ((van hanh) OR (van anh)) de cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thu xang cho hoc. hieu vien cac xuc ((van hanh) or (van anh)) de cua cay*".