Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
chat thuc » thuat thuc, nhan thuc, chat thai
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua
x hoi » xa hoi, x ho, 5 hoi
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: ((tu sach) or (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve chat thuc day hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve chat thuc day hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve chat thuc day hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky nang ((x hoi) OR (o hoi)). hieu ve chat thuc day hanh vi luu tre*.