Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
doan vi » doan va, don vi, doan thi
tu sach » thu sach, su sach, te sach
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
dan vi » don vi, dan va, gan vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu ((va cam) or (va cao)) thuc va ((dan vi) or (doan vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((va cam) OR (va cao)) thuc va ((dan vi) OR (doan vi)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((va cam) or (va cao)) thuc va ((dan vi) or (doan vi)) cua viet*.