Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu nganh » vien nganh, hieu manh, nghiep nganh
thong cong » trong cong, tong cong, phong chong
hiem ngan » kim ngan, viem gan
trung dap » trung cap, trung dai, trung dam
san toan » van toan, dan toan, manh toan
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 ((hieu nganh) or (hiem ngan)) - hanh trung dap ((thong cong) OR (thong thong)) san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (hiem ngan)) - hanh trung dap ((thong cong) OR (thong thong)) san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu nganh) or (hiem ngan)) - hanh trung dap ((thong cong) OR (thong thong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (hiem ngan)) - hanh trung dap ((thong cong) OR (thong thong)) san toan cau*.