Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
ngan cho » ngang cho, ngang tho, nganh che
hanh che » han che, hanh he, hanh nghe
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien 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)) va ((ngan cho) or (hanh che)) hoc. hieu ve cac vuc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) va ((ngan cho) OR (hanh che)) hoc. hieu ve cac vuc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) va ((ngan cho) or (hanh che)) hoc. hieu ve cac vuc van hanh vi cua cau*".