Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh sinh » thanh binh, thanh tinh, thanh vinh
thu sach » tu sach, thuat sach, thu hoach
sinh cua » manh cua, dinh cuu, sinh va
ha thanh » va thanh, pham thanh, phan thanh
quan ha » quan he
cua tre » cua te, cuu tre, cua triet
va nay » va ngay, va cay
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
va nam » van nam, ha nam
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) y nang o hoi. lieu ((va nam) or (va nay)) quan ha thanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang o hoi. lieu ((va nam) OR (va nay)) quan ha thanh sinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang o hoi. lieu ((va nam) or (va nay)) quan ha thanh sinh cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang o hoi. lieu ((va nam) or (va nay)) quan ha thanh sinh cua tre*.