Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thi hanh » thi thanh
hanh bac » nhanh bac, thanh bac, hanh cac
bac nuoc » cac nuoc, bach tuoc, sach nuoc
thai cua » than cua, tai cuc, dai cua
sach ky » sac ky, sach y, sach ty
va dang » van dang, va nang, va lang
x hoi » o hoi, x ho, 5 hoi

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