Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang van » hoang van, hang va
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
bo sach » co sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (bo sach)) ky dang van hoi. ((hieu ve) or (hieu va)) cam xuc va hanh tai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (bo sach)) ky dang van hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh tai cua vat.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (bo sach)) ky dang van hoi. ((hieu ve) or (hieu va)) cam xuc va hanh tai cua vat*.