Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x ho. hieu van cac tuc van hanh vi ((cau tren) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x ho. hieu van cac tuc van hanh vi ((cau tren) OR (cua te))*.