Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trung » thanh trung, hanh trang, manh trung
thong vang » thong van, thong mang, thong vung
hieu xanh » chieu xanh, hieu manh, dieu hanh
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
vang toan » van toan, dang toan, quang toan
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: doc ((hieu xanh) or (hieu nganh)) - hanh trung ((cua thong) OR (cua khong)) thong vang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - hanh trung ((cua thong) OR (cua khong)) thong vang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (hieu nganh)) - hanh trung ((cua thong) OR (cua khong)) thong vang toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (hieu nganh)) - hanh trung ((cua thong) OR (cua khong)) thong vang toan cao*.