Perhaps you should try some spelling variations:
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu lang » chieu sang, hieu quang, nhieu tang
toc hieu » toc thieu, doc hieu, hoc thieu
lang dat » lang dai, lang hat, mang dat
dat dung » dan dung, vat dung, da dung
vung dat » vung va
dung dat » dung va, dung tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu lang - nhanh lang dat dung ((vung dat) OR (dung dat)) phan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu lang - nhanh lang dat dung ((vung dat) OR (dung dat)) phan tu".
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - nhanh lang dat dung ((vung dat) OR (dung dat)) phan tu*.