Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
van cam » van nam, van lam, van cau
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (thuoc sach)) ky sang xa hoi. hieu van cam ((xuc van) OR (duc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuoc sach)) ky sang xa hoi. hieu van cam ((xuc van) OR (duc van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (thuoc sach)) ky sang xa hoi. hieu van cam ((xuc van) OR (duc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuoc sach)) ky sang xa hoi. hieu van cam ((xuc van) OR (duc van)) hanh vi cua tre*.