Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang than » dang thanh, sang than, dang tran
thu sach » tu sach, thuat sach, thu hoach
than cua » nhan cua, thai cua, ban cua
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
va dang » van dang, va nang, va lang
cua te » cua tu
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) OR (van bac)) nuoc va dang 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) OR (van bac)) nuoc va dang 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) OR (van bac)) nuoc va dang than cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ky nang x hoi. thien ((van cac) OR (van bac)) nuoc va dang than cua te*.