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