Perhaps you should try some spelling variations:
thanh trang » thanh trung, thanh thang, thanh tran
thieu sang » chieu sang, thieu khang, thieu quang
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
thanh dung » thanh duong, thanh tung, thanh hung
trinh toan » tinh toan, thanh toan, trinh han
dung cong » dung trong
toan cau » 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 (chieu sach)) - ((thanh trang) OR (hanh trang)) thanh dung cong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sach)) - ((thanh trang) OR (hanh trang)) thanh dung cong trinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sach)) - ((thanh trang) OR (hanh trang)) thanh dung cong trinh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sach)) - ((thanh trang) OR (hanh trang)) thanh dung cong trinh toan cau*.