Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, tran duc
phan dau » phan tu, hang dau
doc sach » hoc sach, toc sach, nuoc sach
hanh via » hanh vi, hanh va, anh va
van hanh » van thanh, ban hanh, van anh
via cuu » via cua, vinh cuu
te sach » toc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo

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