Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
thinh dan » thinh doan, trinh dan, hinh dan
dang cong » dung cong
cong than » cong thanh, cong thang, cong tan
toc hieu » toc thieu, doc hieu, hoc thieu
dat dang » da dang, dat hang, dai dang
phan dau » hang dau
dan dat » dung dat, dong dat, dinh dat

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 - thinh dan dat dang cong than ((phan tu) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu lang - thinh dan dat dang cong than ((phan tu) OR (phan dau))*.