Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tan toan » tan tran, tap toan, van toan
van tuan » van quan, van ban, anh tuan
bai toan » bai 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 - hanh tranh cua nhung cong ((((tan toan) or (van tuan))) or (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh tranh cua nhung cong ((((tan toan) OR (van tuan))) OR (bai toan)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh tranh cua nhung cong ((((tan toan) or (van tuan))) or (bai toan)) ban*.