Perhaps you should try some spelling variations:
thuong dan » thuong han, thuong dam, thuong lan
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua thong » cua thuong, cua khong, suat thong
hoc hieu » hoc thieu, hoc hien, doc hieu
cua tong » cua cong, cua dong, cua nong
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 manh - hanh tinh ((cua thong) OR (cua tong)) ((thuong dan) or (huong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh tinh ((cua thong) OR (cua tong)) ((thuong dan) OR (huong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hanh tinh ((cua thong) OR (cua tong)) ((thuong dan) or (huong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh tinh ((cua thong) OR (cua tong)) ((thuong dan) or (huong dan)) toan cao*.