Perhaps you should try some spelling variations:
thuong thong » thong thong, thuong trong, thuong phuong
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
cua thuong » cua truong, cua phuong, ca thuong
trung cua » truong cua, trung tuan, trung cap
thong van » trong van, thong va, thong quan
van phan » van phong, van thanh, luan phan
phan dau » phan tu, hang dau
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu va) or (chieu sang)) - thanh trung cua thuong thong van phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu va) OR (chieu sang)) - thanh trung cua thuong thong van phan dau.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu va) or (chieu sang)) - thanh trung cua thuong thong van phan dau*.