Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
hieu ve » hieu va
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((o hai) or (x ho)). ((hieu ve) OR (hieu van)) cham soc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((o hai) OR (x ho)). ((hieu ve) OR (hieu van)) cham soc va danh doi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((o hai) or (x ho)). ((hieu ve) OR (hieu van)) cham soc va danh doi cua tre*".