Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
van hoi » van hoa, van hoc, van hoe
danh va » doanh va, hanh va, anh va
cuu tre » cua tre, cau tren, cau treo
xuc va » tuc va, luc va, xac va
va cuu » va cau, va chu, va huu

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 (toc sach)) ky nang van hoi. hieu van nam ((xuc va) or (duc va)) danh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang van hoi. hieu van nam ((xuc va) OR (duc va)) danh va cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang van hoi. hieu van nam ((xuc va) or (duc va)) danh va cuu tre*.