Perhaps you should try some spelling variations:
thanh thanh » nhanh thanh, thanh toan, thanh phan
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua thong » cua thuong, cua khong, cua tong
thanh cac » hanh cac, thanh bac, thanh ca
cuu nang » chuc nang, cam nang, cuu van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (theo chieu)) tach - thanh trung ((cua thong) or (cuu nang)) cong thanh thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (theo chieu)) tach - thanh trung ((cua thong) OR (cuu nang)) cong thanh thanh cac.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (theo chieu)) tach - thanh trung ((cua thong) or (cuu nang)) cong thanh thanh cac*.