Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh doi » thanh doi, hanh noi, hang doi
dang xay » dang van, van xay
chat duc » chat xuc, chat doc, chet duoc
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
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: te sach y ((nang xa) or (dang xay)) hoi. ((hieu van) OR (hieu va)) chat duc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (dang xay)) hoi. ((hieu van) OR (hieu va)) chat duc va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (dang xay)) hoi. ((hieu van) OR (hieu va)) chat duc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (dang xay)) hoi. ((hieu van) OR (hieu va)) chat duc va hanh doi cua tre*.