Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
va dat » va dao, va dau, va dap
dat ve » dat va, dat de, dat vi
cua te » cua tu

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 dang xa hoi. hieu ve cham luc va dat ve ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky dang xa hoi. hieu ve cham luc va dat ve ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky dang xa hoi. hieu ve cham luc va dat ve ((cua te) or (cuu tre))*.