Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
dang van » hoang van, hang va
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, cac nuoc, cac cuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma

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 van)) hoi. hieu ve ((cac luc) OR (coc luc)) va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (dang van)) hoi. hieu ve ((cac luc) OR (coc luc)) va hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (dang van)) hoi. hieu ve ((cac luc) OR (coc luc)) va hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (dang van)) hoi. hieu ve ((cac luc) OR (coc luc)) va hanh hai cua tre*.