Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
nang hoa » nang hoat, hang hoa, nang hoc
cac xuc » cam xuc, cac nuoc, cac cuoc
cua cay » cua cac
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
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)) ty nang hoa hoc. hieu ve ((cac xuc) or (chat xuc)) van hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang hoa hoc. hieu ve ((cac xuc) OR (chat xuc)) van hanh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang hoa hoc. hieu ve ((cac xuc) or (chat xuc)) van hanh vi cua cay*".