Perhaps you should try some spelling variations:
thien van » thi van
danh thai » anh thai, dang thai, dinh thai
thu sach » tu sach, thuat sach, thuoc sach
cac nuoc » cap nuoc, dat nuoc, cua nuoc
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
cua te » cua tu
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: thu sach ky nang ((x hoi) OR (o hoi)). thien van ((cac nuoc) or (hoc nuoc)) va danh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (o hoi)). thien van ((cac nuoc) OR (hoc nuoc)) va danh thai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (o hoi)). thien van ((cac nuoc) or (hoc nuoc)) va danh thai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (o hoi)). thien van ((cac nuoc) or (hoc nuoc)) va danh thai cua te*.