Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
phan duc » pham duc, phan tu, phan dau
doc sach » hoc sach, toc sach, nuoc sach
van hanh » ban hanh, van anh, van ban
te sach » toc sach
via cuu » via cua, vinh cuu
va phan » van phan, va phat, va phap
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 ((van hanh) OR (van thanh)) 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 ((van hanh) OR (van thanh)) 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 ((van hanh) OR (van thanh)) via cuu tre*".