Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh thai » anh thai, dang thai, dinh thai
thai cao » tai cao, thoai cac, thuat cao
cao tren » ca tren, cau tren, co tren
va chat » van chat, va phat, cao chat
tu sac » tu sach, tu cac, tu san
xuc va » tuc va, luc va, xac va
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) OR (duc va)) danh 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) OR (duc va)) danh 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) OR (duc va)) danh 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) OR (duc va)) danh thai cao tren*.