Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
thiet hung » thuyet hung, hiep hung, thpt hung
hoc thieu » toc thieu, hoc hien
viet hung » viet huong, viet trung
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 - hanh trinh ((thiet hung) OR (viet hung)) cong san toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh trinh ((thiet hung) OR (viet hung)) cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh ((thiet hung) OR (viet hung)) cong san toan cao*.