Perhaps you should try some spelling variations:
hoan chinh » hanh chinh
trong dan » trong dang, trong san, trong tan
hoa hinh » hoa sinh, hoa binh, mo hinh
tranh va » tranh van, trang va, trinh va
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoan chinh) OR (hoa hinh)) sach - canh tranh va dung trong dan ((toan tai) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoan chinh) OR (hoa hinh)) sach - canh tranh va dung trong dan ((toan tai) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoan chinh) OR (hoa hinh)) sach - canh tranh va dung trong dan ((toan tai) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ((hoan chinh) OR (hoa hinh)) sach - canh tranh va dung trong dan ((toan tai) or (toan tap))*.