Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » hang cong, nhung don, nhung lang
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
trinh va » trinh van, trinh vat, trinh ve
sat phan » sat nhan, vat phan, xuat 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 hieu manh - canh trinh va ((((nhung cong) OR (dung cong))) or (thong cong)) sat phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh trinh va ((((nhung cong) OR (dung cong))) OR (thong cong)) sat phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh trinh va ((((nhung cong) OR (dung cong))) or (thong cong)) sat phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh va ((((nhung cong) OR (dung cong))) or (thong cong)) sat phan cau*.