Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
toc sach » hoc sach, doc sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
cuc te » cua te, cuc thue, cuc tieu

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 (toc sach)) ky ((nang x) or (nang ma)) hoi. hieu va chat xuc va hanh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky ((nang x) OR (nang ma)) hoi. hieu va chat xuc va hanh tai cuc te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky ((nang x) or (nang ma)) hoi. hieu va chat xuc va hanh tai cuc te*.