Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
xuc manh » suc manh, duc manh, duc minh
van cam » van nam, van lam, van cau
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
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: ((tu sach) OR (thu sach)) vu nang xa hoi. hieu van cam xuc manh ((thanh loi) or (dung tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) vu nang xa hoi. hieu van cam xuc manh ((thanh loi) OR (dung tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) vu nang xa hoi. hieu van cam xuc manh ((thanh loi) or (dung tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) vu nang xa hoi. hieu van cam xuc manh ((thanh loi) or (dung tai)) cua tre*.