Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
canh trinh » canh tranh, hanh trinh, canh tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong san » cong tac
pham dau » phan dau, pham dat, phap dau
pham dac » pham duc, pham dang, pham sach

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 thong cong san ((pham dau) OR (pham dac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh trinh va thong cong san ((pham dau) OR (pham dac))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh va thong cong san ((pham dau) OR (pham dac))*.