Perhaps you should try some spelling variations:
thanh tung » thanh cong
phuong dan » phuong danh, phuong doan, huong dan
hieu manh » chieu xanh, hieu nganh, hien hanh
tung can » trung can, tung dan, trung cap
can bang » cao bang, can ban, van ban
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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) OR (dieu hanh)) - thanh tung can bang phuong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (dieu hanh)) - thanh tung can bang phuong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (dieu hanh)) - thanh tung can bang phuong dan toan cau*.