Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
dang van » hoang van, hang va
su sach » so sach, vu sach
tai cuu » tai cuc, tai buu, tai cua
truc va » thuc va, trung va
cuu tre » cua tre, cau tren, cau treo
ky dang » ky nang, ky danh
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (toc sach)) ky dang van hoa. lieu va cam ((truc va) OR (thuc vat)) hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky dang van hoa. lieu va cam ((truc va) OR (thuc vat)) hanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky dang van hoa. lieu va cam ((truc va) OR (thuc vat)) hanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky dang van hoa. lieu va cam ((truc va) OR (thuc vat)) hanh tai cuu tre*.