Perhaps you should try some spelling variations:
sang tao » hang tai
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
danh va » doanh va, hanh va, anh va
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tuc va » thuc va, tuc xa, duc va
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((dang xay) or (sang tao)) hoi. hieu ve cam ((tuc va) or (truc va)) danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xay) OR (sang tao)) hoi. hieu ve cam ((tuc va) OR (truc va)) danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xay) or (sang tao)) hoi. hieu ve cam ((tuc va) or (truc va)) danh va cua tre*.