Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, dua tren
y dang » ky dang, 2 dang, _ dang
xuc va » tuc va, luc va, xac va
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y dang xay hoi. hieu van nam ((xuc va) OR (duc va)) anh va ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y dang xay hoi. hieu van nam ((xuc va) OR (duc va)) anh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y dang xay hoi. hieu van nam ((xuc va) OR (duc va)) anh va ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y dang xay hoi. hieu van nam ((xuc va) OR (duc va)) anh va ((cua tre) or (cua triet))*.