Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
thuc day » thuc dan, thuc vat
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
va nam » van nam, ha nam, va nay
te san » te ban, ke san, tu san
te sac » te sach, te cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (te san)) ky lang ha hoi. hieu va nam ((thuc va) OR (thuc day)) hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky lang ha hoi. hieu va nam ((thuc va) OR (thuc day)) hanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te san)) ky lang ha hoi. hieu va nam ((thuc va) OR (thuc day)) hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te san)) ky lang ha hoi. hieu va nam ((thuc va) OR (thuc day)) hanh tri cua tre*.