Perhaps you should try some spelling variations:
dung cong » dung trong
canh manh » lanh manh, canh tranh, cach mang
hoc hieu » hoc thieu, hoc hien, doc hieu
manh vat » manh va, nganh vat, sinh vat
vat dung » van dung, va dung, viet dung
van tuan » van quan, anh tuan
dan than » dan chan, ban than, van than
hieu ca » hieu cac, hieu cua, hieu va

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 ca - canh manh vat dung cong ((((van tuan) OR (van ban))) or (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu ca - canh manh vat dung cong ((((van tuan) OR (van ban))) OR (dan than)) tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu ca - canh manh vat dung cong ((((van tuan) OR (van ban))) or (dan than)) tap*".