Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung vung » nhung dung, nhung huong, nhung tuong
hieu xanh » chieu xanh, hieu manh, dieu hanh
cong hanh » cong thanh, cong khanh, hong hanh
vung manh » hung manh, tung manh, vung lanh
toan tap » toan ban
hanh va » hang va, hanh vi

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)) - cong hanh va nhung vung manh ((van ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - cong hanh va nhung vung manh ((van ban) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - cong hanh va nhung vung manh ((van ban) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu nganh)) - cong hanh va nhung vung manh ((van ban) or (toan tap))*.