Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
hoc thieu » toc thieu
canh manh » lanh manh, canh tranh, cach mang
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong ty
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (hoc hien)) hach - canh manh cua dung ((cong tan) OR (cong thanh)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) hach - canh manh cua dung ((cong tan) OR (cong thanh)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) hach - canh manh cua dung ((cong tan) OR (cong thanh)) chan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) hach - canh manh cua dung ((cong tan) OR (cong thanh)) chan cau*.