Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
hanh trinh » canh tranh, hanh chinh
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
hoc thieu » toc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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 quang - hanh trinh va dung ((cong thanh) OR (dong thanh)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - hanh trinh va dung ((cong thanh) OR (dong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - hanh trinh va dung ((cong thanh) OR (dong thanh)) toan cao*.