Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien bach » vien bach, thien hach, hien hanh
cac tren » ca tren, cau tren, rac tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu hien bach ((xuc va) OR (duc va)) hanh va cac tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu hien bach ((xuc va) OR (duc va)) hanh va cac tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu hien bach ((xuc va) OR (duc va)) hanh va cac tren*.