Perhaps you should try some spelling variations:
hanh thong » anh thong, hanh trong, hang thong
thieu sang » chieu sang, thieu khang, thieu quang
hieu lang » chieu sang, hieu quang, nhieu tang
quan dong » quang dong, quan long, quan hoang
dong cong » duong cong, dung cong, dang cong
cong tinh » cong trinh, cong vinh, long tinh
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) or (hieu lang)) - hanh thong quan dong cong tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (hieu lang)) - hanh thong quan dong cong tinh toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu lang)) - hanh thong quan dong cong tinh toan cao*.