Perhaps you should try some spelling variations:
bieu toan » hieu toan, kiem toan, bien soan
cau tren » dau tren, ca tren, cau treo
vat hanh » vat thanh, van hanh, va hanh
ban thuc » ban thuoc, dan thuc, van thuc
lang van » dang van, tang van, hoang van
toan ban » van ban
hanh va » hang va, hanh vi
cu tren » tu tren, dua tren
lang xa » lang ha, dang xay
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((lang xa) OR (lang van)) hoi. bieu toan ban thuc vat hanh va ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((lang xa) OR (lang van)) hoi. bieu toan ban thuc vat hanh va ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((lang xa) OR (lang van)) hoi. bieu toan ban thuc vat hanh va ((cau tren) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((lang xa) OR (lang van)) hoi. bieu toan ban thuc vat hanh va ((cau tren) or (cu tren))*.