Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
cau luc » cau truc, cau phuc
van cau » van dau, van hau, van chat
lap hai » lap tai, lap lai, lap hoat
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 hai. hieu van cau luc ((va dinh) or (va tinh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky sang) OR (ky dang)) lap hai. hieu van cau luc ((va dinh) OR (va tinh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ((ky sang) or (ky dang)) lap hai. hieu van cau luc ((va dinh) or (va tinh)) vi cua te*.