Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, xuc ban
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam

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 dang xay hoi. hieu ve cam xuc van hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xay hoi. hieu ve cam xuc van hanh ((vai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang xay hoi. hieu ve cam xuc van hanh ((vai cua) or (hai cua)) tre*.