Perhaps you should try some spelling variations:
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va nay » va ngay, va cay
tuc va » truc va, tuc xa, duc va
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((o hoi) or (xa hoi)). lieu va nay ((tuc va) OR (thuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((o hoi) OR (xa hoi)). lieu va nay ((tuc va) OR (thuc va)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((o hoi) or (xa hoi)). lieu va nay ((tuc va) OR (thuc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((o hoi) or (xa hoi)). lieu va nay ((tuc va) OR (thuc va)) hanh vi cua tre*.