Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
ve cao » va cao, ve cac, ve co
ve bao » te bao, va bao
ve cau » ke cau, va cau, ve cac
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: su sach ky nang x hoi. hieu ((ve cao) OR (ve bao)) duc va hanh ve cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((ve cao) OR (ve bao)) duc va hanh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((ve cao) OR (ve bao)) duc va hanh ve cau tren*.