Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh via » hanh vi, hanh va, anh va
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va phan » van phan, va phat, va phap
duc van » duc va, duc manh, duc phan
via cuu » via cua, vinh cuu
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

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