Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
lap hoat » tap hoa, dan hoat, lap dat
su sach » so sach, vu sach
va hanh » va thanh, va danh, ban hanh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ve cac » va cac, vien cac
vi cua » vai cua, di cua
cua te » cua tu

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 sang) or (ky dang)) lap hoat. hieu ve cac xuc ((va hanh) OR (van hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky dang)) lap hoat. hieu ve cac xuc ((va hanh) OR (van hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) or (ky dang)) lap hoat. hieu ve cac xuc ((va hanh) OR (van hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky dang)) lap hoat. hieu ve cac xuc ((va hanh) OR (van hanh)) vi cua te*.