Perhaps you should try some spelling variations:
thuong thuat » thuong thuyet, thuong thuc, trong thuat
hanh thuong » khanh thuong, thanh thuong, hang thuong
thuat nhung » thuat hung, thuat chung, thuat chuong
chieu sang » chieu sach, chieu xanh, nhieu tang
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » hieu quang, nhieu tang, hieu van
cong tac » cong ty
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: hoc ((chieu sang) OR (hieu lang)) - hanh thuong thuat nhung ((cong thanh) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - hanh thuong thuat nhung ((cong thanh) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (hieu lang)) - hanh thuong thuat nhung ((cong thanh) or (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (hieu lang)) - hanh thuong thuat nhung ((cong thanh) or (cong tac)) toan cau*.