Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
dinh dat » dinh ket, dinh van, dinh lam
cac phuc » cau phuc, khac phuc, cach thuc
cua tre » cua te, cuu tre, dua tren
vu dinh » quy dinh
tu sach » thu sach, su sach, te sach
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
ha hoi » hoa hoi, ha noi, xa hoi

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) or (toc sach)) ky dang ha hoi. hieu ve cac phuc vu dinh dat ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky dang ha hoi. hieu ve cac phuc vu dinh dat ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky dang ha hoi. hieu ve cac phuc vu dinh dat ((cua tre) or (cua triet))*.