Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
nham thuc » nhan thuc, nam thuc, nham thu
nang dai » nang dau, nang tai, lang dai
qua nham » qua nhat, qua cham, sua nham
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, cua vat, cua dieu
so sach » so sanh, bo sach, co sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
dai hoi » dai hoc, dai hai, dai moi
thuc va » thuc vat, thuc dan, thuc day

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 vu nang dai hoi. hieu qua nham thuc va thanh vai ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach vu nang dai hoi. hieu qua nham thuc va thanh vai ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: so sach vu nang dai hoi. hieu qua nham thuc va thanh vai ((cua viet) or (hoa viet))*.