Perhaps you should try some spelling variations:
dang thai » dang thi, dang khai, lang thai
thu sach » tu sach, thuat sach, thuoc sach
bac nuoc » bach tuoc, sach nuoc, hoc nuoc
dang hai » dang khai, hang hai, dung hai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
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: thu sach ky nang x hoi. thi van ((bac nuoc) OR (cac nuoc)) va ((dang thai) or (dang hai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. thi van ((bac nuoc) OR (cac nuoc)) va ((dang thai) OR (dang hai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. thi van ((bac nuoc) OR (cac nuoc)) va ((dang thai) or (dang hai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. thi van ((bac nuoc) OR (cac nuoc)) va ((dang thai) or (dang hai)) cua viet*.