Perhaps you should try some spelling variations:
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 van » cong vang, cong san, song van
van hanh » van thanh, ban hanh, van anh
hanh cay » nhanh cay, hanh cac, hanh cat

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 van hanh cay~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - tinh toan ((tuan dang) or (tran dang)) cong van hanh cay*.