Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang thai » dang thi, dang khai, lang thai
bac nuoc » cac nuoc, bach tuoc, sach nuoc
dang hai » dang khai, hang hai, dong hai
dung hai » dung tai, dung ha, dung sai
thi van » thi lan, thi hanh, thi nang
van bac » van ban, van bao, van hac
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang x hoi. thi van bac nuoc va ((dang thai) or (((dang hai) OR (dung hai)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang x hoi. thi van bac nuoc va ((dang thai) OR (((dang hai) OR (dung hai)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang x hoi. thi van bac nuoc va ((dang thai) or (((dang hai) OR (dung hai)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang x hoi. thi van bac nuoc va ((dang thai) or (((dang hai) OR (dung hai)))) cua tre*.