Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va tinh » may tinh
va chua » vua chua, ca chua, va chu
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
va cua » via cua, ca cua, ma cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ky lang) or (ky nang)) xa hoi. hieu va cau luc va tinh ((va cua) or (va chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky lang) OR (ky nang)) xa hoi. hieu va cau luc va tinh ((va cua) OR (va chua)) tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky lang) or (ky nang)) xa hoi. hieu va cau luc va tinh ((va cua) or (va chua)) tre*.