Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
hieu van » hieu va, thien van, lieu va
nang xay » nganh xay, nang xuan, nang cao
toan luu » toan lua, thanh luu, toan luan
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
chat xuc » chat huu, cam xuc, chao xu
tu sach » thu sach, su sach, te sach
luu tre » luu tru, cuu tre, luy tre
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
xuc va » duc va, tuc va, luc va

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 ((nang xay) or (dang xay)) hoi. ((hieu ve) OR (hieu van)) chat xuc va thanh toan luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xay) OR (dang xay)) hoi. ((hieu ve) OR (hieu van)) chat xuc va thanh toan luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xay) or (dang xay)) hoi. ((hieu ve) OR (hieu van)) chat xuc va thanh toan luu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xay) or (dang xay)) hoi. ((hieu ve) OR (hieu van)) chat xuc va thanh toan luu tre*.