Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
dau tren » dau tien, dat tren, dau tieng
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
vi dau » vi dai, va dau, bi dau
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang x hoi. hieu va cam ((xuc va) OR (thuc day)) hanh vi dau tren~.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) nang x hoi. hieu va cam ((xuc va) or (thuc day)) hanh vi dau tren*.