Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
dung cong » dung trong
hieu cua » hieu qua, dieu cua, hieu ca
bieu cua » dieu cua, ben cua, dien cua
san dung » van dung, dan dung, tan dung
van vat » van chat, nhan vat
tan van » tran van, tang van, luan 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 ((hieu cua) OR (bieu cua)) - canh thanh san dung cong ((van vat) OR (tan van)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cua) OR (bieu cua)) - canh thanh san dung cong ((van vat) OR (tan van)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cua) OR (bieu cua)) - canh thanh san dung cong ((van vat) OR (tan van)) cau*.