Perhaps you should try some spelling variations:
vang nhanh » vung nhanh, van thanh, van hanh
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
tuan dang » tuan bang, tuan dung, tuan duong
tran dang » tran quang, tran hoang, tranh hang
cong vang » cong lang, cong quang, cong ngang
nhanh va » hanh va, nhan va, nhanh ha

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - tinh toan ((tuan dang) OR (tran dang)) cong vang nhanh va~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - tinh toan ((tuan dang) or (tran dang)) cong vang nhanh va*.