Perhaps you should try some spelling variations:
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua thong » cua thuong, cua khong, cua tong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong san, cong thanh
chan cac » chon cac, nhan cach, thanh cac
phan cac » nhan cach, phan dau, phan lap

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 - ((thanh trung) OR (thanh tung)) cua thong cong tan ((chan cac) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((thanh trung) OR (thanh tung)) cua thong cong tan ((chan cac) OR (phan cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((thanh trung) OR (thanh tung)) cua thong cong tan ((chan cac) or (phan cac))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((thanh trung) OR (thanh tung)) cua thong cong tan ((chan cac) or (phan cac))*.