Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thi nang » thi cong, ki nang, thi hanh
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
cua chu » sua chua
nang xa » nang x, lang xa, nang ma
di cua » dai cua, doi cua, de cua
ve cac » vien cac

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)) thi nang xa hoi. hieu ((ve cac) or (va cac)) xuc van hanh di cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thi nang xa hoi. hieu ((ve cac) OR (va cac)) xuc van hanh di cua chu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thi nang xa hoi. hieu ((ve cac) or (va cac)) xuc van hanh di cua chu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) thi nang xa hoi. hieu ((ve cac) or (va cac)) xuc van hanh di cua chu*.