Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thuat sach » thuat lanh, thuat san
canh trinh » canh tranh, hanh trinh, canh tinh
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
khang dau » hang dau, xang dau, nang dau
vat dung » van dung, va dung, viet dung
cong van » cong vang, cong san, song van
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoa ((thiet tach) or (thuat sach)) - canh trinh vat dung cong van ((khang dau) OR (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoa ((thiet tach) OR (thuat sach)) - canh trinh vat dung cong van ((khang dau) OR (phan dau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoa ((thiet tach) or (thuat sach)) - canh trinh vat dung cong van ((khang dau) OR (phan dau))*".