Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thong lanh » thong danh, tuong lanh, thong thanh
lanh toan » manh toan, anh toan, thanh toan
ho thieu » hoc thieu, ho chieu, ho thiet
trung va » truong va, trang va, trung ha
tran van » luan van
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: ho thieu quang - hanh ((trung va) or (tran van)) thong thong lanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thieu quang - hanh ((trung va) OR (tran van)) thong thong lanh toan cau.
• Adding a wildcard symbol may retrieve word variants: ho thieu quang - hanh ((trung va) or (tran van)) thong thong lanh toan cau*.