Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong cong » phuong dong, phong cong, phung cong
thieu sang » chieu sang, thieu khang, thieu quang
hanh trang » canh tranh, hanh trinh, minh trang
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
va phuong » va thuong, cac phuong
toan cao » toan ban
toan tap » toan ban

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 - ((thanh trung) or (hanh trang)) va phuong cong thanh ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((thanh trung) OR (hanh trang)) va phuong cong thanh ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((thanh trung) or (hanh trang)) va phuong cong thanh ((toan cao) or (toan tap))*.