Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
ky dinh » ky sinh, ky danh, ky kinh
van cam » van nam, van lam, van cau
tai cua » thai cua, tai cuc, tri cua
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ky dinh van hoa. hieu van cam ((xuc va) OR (duc va)) hanh tai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky dinh van hoa. hieu van cam ((xuc va) OR (duc va)) hanh tai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky dinh van hoa. hieu van cam ((xuc va) OR (duc va)) hanh tai cua vat".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky dinh van hoa. hieu van cam ((xuc va) OR (duc va)) hanh tai cua vat*.