Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
hanh tran » hanh trang, thanh tran, hanh tram
phan cong » thanh cong
san thanh » ban thanh, van thanh, son thanh
thanh cau » thanh chau, thanh mau, nhanh cau
tran van » luan van
ban cong » bang cong, van cong, ban huong

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) or (hieu qua)) - hanh tran van ((ban cong) OR (phan cong)) san thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((thieu quang) OR (hieu qua)) - hanh tran van ((ban cong) OR (phan cong)) san thanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thieu quang) or (hieu qua)) - hanh tran van ((ban cong) OR (phan cong)) san thanh cau".
• Adding a wildcard symbol may retrieve word variants: ho ((thieu quang) or (hieu qua)) - hanh tran van ((ban cong) OR (phan cong)) san thanh cau*.