Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hanh via » hanh vi, hanh va, anh va
van hanh » van thanh, ban hanh, van anh
phan dau » phan tu, hang dau
qua phan » cua phan, qua than, quang phan
te sach » toc sach
via cua » gia cua, gian cua, giau cua
dau van » dao van, dam van, dau va
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

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 (doc sach)) ky ((nang xa) OR (lang xa)) hoi. hieu qua phan dau van hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ky ((nang xa) OR (lang xa)) hoi. hieu qua phan dau van hanh via cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (doc sach)) ky ((nang xa) OR (lang xa)) hoi. hieu qua phan dau van hanh via cua tre*".