Perhaps you should try some spelling variations:
thuyet hach » thuyet mach, thuyet xac, thuyet cac
hoc thuyet » hoc chuyen
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, nhung don
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
van tuan » van quan, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuyet hach - hanh tranh cua ((nhung cong) OR (hang cong)) ((van tuan) or (van ban)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet hach - hanh tranh cua ((nhung cong) OR (hang cong)) ((van tuan) OR (van ban)) cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuyet hach - hanh tranh cua ((nhung cong) OR (hang cong)) ((van tuan) or (van ban)) cu".
• Adding a wildcard symbol may retrieve word variants: hoc thuyet hach - hanh tranh cua ((nhung cong) OR (hang cong)) ((van tuan) or (van ban)) cu*.