Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh thai » anh thai, dinh thai, danh thanh
dang thai » dang thi, dang hai, dang khai
cao tren » ca tren, cau tren, co tren
chat xuc » chat huu, cam xuc, chao xu
va chat » van chat, va phat, cao chat
xuc va » duc va, tuc va, luc va
tu sac » tu sach, tu cac, tu san
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: ((tu sac) or (thuoc sach)) ky nang x hoi. lieu va chat xuc va ((danh thai) OR (dang thai)) cao tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thuoc sach)) ky nang x hoi. lieu va chat xuc va ((danh thai) OR (dang thai)) cao tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (thuoc sach)) ky nang x hoi. lieu va chat xuc va ((danh thai) OR (dang thai)) cao tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thuoc sach)) ky nang x hoi. lieu va chat xuc va ((danh thai) OR (dang thai)) cao tren*.