Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
cam duc » cao duc, pham duc, nam duoc
hieu ve » hieu va, hieu van
lap lai » lap tai, lay lai, lam lai
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
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: so sach ((ky sang) or (ky dang)) lap lai. hieu ve ((cam duc) OR (cam xuc)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky sang) OR (ky dang)) lap lai. hieu ve ((cam duc) OR (cam xuc)) va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ky sang) or (ky dang)) lap lai. hieu ve ((cam duc) OR (cam xuc)) va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((ky sang) or (ky dang)) lap lai. hieu ve ((cam duc) OR (cam xuc)) va hanh vi cua te*.