Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
dang xay » dang van, van xay
sach ty » sach tu, sach thu, xach tay
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
toc va » hoc va, toc ta, tuc va
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 ty) or (sach y)) dang xay hoi. hieu va cac toc va ((thanh vi) OR (thanh va)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach y)) dang xay hoi. hieu va cac toc va ((thanh vi) OR (thanh va)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) or (sach y)) dang xay hoi. hieu va cac toc va ((thanh vi) OR (thanh va)) cua tu".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach y)) dang xay hoi. hieu va cac toc va ((thanh vi) OR (thanh va)) cua tu*.