Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
nang cho » nang chon, ngang cho, nang cao
te cach » ve cach, tu cach, te cac
van anh » van thanh, tuan anh, van minh
cac vuc » cac nuoc, cac vung, cac cuoc
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
tu nang » tru nang, tu nong, tu nano
te sach » toc sach
cua cay » cua cac
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cach) OR (te sach)) tu nang cho hoc. hieu va cac vuc ((van hanh) OR (van anh)) vi cua cay~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cach) OR (te sach)) tu nang cho hoc. hieu va cac vuc ((van hanh) or (van anh)) vi cua cay~".
• Adding a wildcard symbol may retrieve word variants: ((te cach) OR (te sach)) tu nang cho hoc. hieu va cac vuc ((van hanh) or (van anh)) vi cua cay*.