Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
dang xay » dang van, van xay
cao toc » cac toc, cao hoc, cao thuoc
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
cam toc » cac toc
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) or (sach y)) dang xay hoi. hieu ve ((cam toc) OR (cao toc)) gia thanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) dang xay hoi. hieu ve ((cam toc) OR (cao toc)) gia thanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) or (sach y)) dang xay hoi. hieu ve ((cam toc) OR (cao toc)) gia thanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) or (sach y)) dang xay hoi. hieu ve ((cam toc) OR (cao toc)) gia thanh vi cua tu*.