Perhaps you should try some spelling variations:
trinh thiet » trinh thi
thieu sang » chieu sang, thieu khang, thieu quang
trinh viet » ninh viet, trinh vat
hoc thieu » toc thieu, hoc hien
hung cong » nhung cong, hung cuong, phung cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, 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) OR (trinh viet)) hung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trinh thiet) OR (trinh viet)) hung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh thiet) OR (trinh viet)) hung cong dan toan cao*.