Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
chat doc » chat hoc, chau doc, thuat doc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
vai cua » hai cua, lai cua, bai cua

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 xa hoi. hieu va chat doc ((van hanh) or (ban hanh)) ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu va chat doc ((van hanh) OR (ban hanh)) ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu va chat doc ((van hanh) or (ban hanh)) ((vai cua) or (dai cua)) tre*.