Perhaps you should try some spelling variations:
thong thuong » thong thong, hang thuong, cong thuong
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
hanh trinh » canh tranh, hanh chinh
manh toan » thanh toan, anh tuan
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong

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) OR (trien quang)) - hanh trinh va thong thuong ((manh toan) or (tinh toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (trien quang)) - hanh trinh va thong thuong ((manh toan) OR (tinh toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) OR (trien quang)) - hanh trinh va thong thuong ((manh toan) or (tinh toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) OR (trien quang)) - hanh trinh va thong thuong ((manh toan) or (tinh toan)) ban*.