Perhaps you should try some spelling variations:
thong hoang » phuong hoang, thong thong, khung hoang
thieu sang » chieu sang, thieu khang, thieu quang
canh trinh » canh tranh, hanh trinh, canh tinh
trinh nhan » trinh han, trinh phan, trinh nha
nhan thong » nhan trong, nha thong, nhan khong
hoc thieu » toc thieu, hoc hien
hoang van » hang va
than cau » phan cau, than cap, thanh chau
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 - canh trinh nhan thong hoang van ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh trinh nhan thong hoang van ((than cau) OR (toan cau))*.