Perhaps you should try some spelling variations:
hien manh » hien hanh, hieu manh, hien nhanh
tien manh » tien anh, tien thanh, tieng anh
lang song » nang song, bang song, lang son
trinh va » trinh van, trinh vat, trinh ve
song dan » song danh, song van, cong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien manh) OR (tien manh)) - canh ((trinh va) or (trinh luat)) lang song dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (tien manh)) - canh ((trinh va) OR (trinh luat)) lang song dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (tien manh)) - canh ((trinh va) or (trinh luat)) lang song dan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (tien manh)) - canh ((trinh va) or (trinh luat)) lang song dan phan cau*.