Perhaps you should try some spelling variations:
thong thuong » thong thong, hang thuong, cong thuong
thuong dan » huong dan, thuong han, thuong dam
hieu manh » chieu xanh, hieu nganh, dieu hanh
hiem ngan » kim ngan, viem gan
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cua thong » cua thuong, cua khong, cua tong
sinh cua » manh cua, dinh cuu, sinh va
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (hiem ngan)) - hanh sinh cua thong thuong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hiem ngan)) - hanh sinh cua thong thuong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hiem ngan)) - hanh sinh cua thong thuong dan than cau*.