Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
chat duc » chat xuc, chat doc, chet duoc
danh hai » dang hai, lanh hai, manh hai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sach thieu)) nang xa hoi. ((hieu van) OR (hieu va)) chat duc va danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach thieu)) nang xa hoi. ((hieu van) OR (hieu va)) chat duc va danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sach thieu)) nang xa hoi. ((hieu van) OR (hieu va)) chat duc va danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach thieu)) nang xa hoi. ((hieu van) OR (hieu va)) chat duc va danh hai cua tre*.