Perhaps you should try some spelling variations:
cac trieu » cac tieu, cau trieu, cac kieu
thu sach » tu sach, thuat sach, thuoc sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
qua cao » qua cac, qua ca, qua cai
cao xuc » cam xuc, cao duc, cao suc
va vanh » va danh, va hanh, va anh
tai cac » tai cuc

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 ((ky lang) OR (ky tang)) xa hoi. hieu qua cao xuc ((va vanh) or (va van)) tai cac trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) xa hoi. hieu qua cao xuc ((va vanh) OR (va van)) tai cac trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky tang)) xa hoi. hieu qua cao xuc ((va vanh) or (va van)) tai cac trieu".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky tang)) xa hoi. hieu qua cao xuc ((va vanh) or (va van)) tai cac trieu*.