Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
cau luoc » cau luc, muu luoc, cau hoc
sach ky » sac ky, sach y, sach ty
hau loc » huu loc, phau hoc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
doi va » hoi va, noi va, dai 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 dang xay hoi. ((hieu ve) or (lieu va)) ((cau luoc) or (hau loc)) gia thanh doi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. ((hieu ve) OR (lieu va)) ((cau luoc) OR (hau loc)) gia thanh doi va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. ((hieu ve) or (lieu va)) ((cau luoc) or (hau loc)) gia thanh doi va triet*.