Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, hinh tai
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
han tai » hang tai, nhan tai, van tai
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
va am » va lam, va cam

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 sac) OR (te cac)) ky nang x ho. hieu va am thuc va ((hanh tai) OR (han tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te cac)) ky nang x ho. hieu va am thuc va ((hanh tai) OR (han tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang x ho. hieu va am thuc va ((hanh tai) OR (han tai)) cua tre*.