Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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) OR (so sach)) y nang xa hoi. hieu qua cac luc va dan va cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang xa hoi. hieu qua cac luc va dan va cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang xa hoi. hieu qua cac luc va dan va cua viet*.