Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc day » thuc dan, thuc vat
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
nang o » nang co, nang ho, nang ro
xuc va » duc va, luc va, xac va
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang o hai. hieu va tham ((xuc va) or (((tuc va) or (thuc day)))) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang o hai. hieu va tham ((xuc va) OR (((tuc va) OR (thuc day)))) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang o hai. hieu va tham ((xuc va) or (((tuc va) or (thuc day)))) hanh vi cua viet*.