Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
quoc lan » quoc ban, nuoc luan, quoc quan
sach ky » sac ky, sach y, sach ty
nang so » nang som, nang co, nang ho
hieu va » lieu va, hieu qua
cuc ban » cua ban, cac ban, cuu ban
so hai » son hai, su hai, so ha
di cua » doi cua, de cua, do 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 nang so hai. hieu va cac ((cuc ban) or (quoc lan)) anh ((di cua) OR (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang so hai. hieu va cac ((cuc ban) OR (quoc lan)) anh ((di cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang so hai. hieu va cac ((cuc ban) or (quoc lan)) anh ((di cua) OR (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang so hai. hieu va cac ((cuc ban) or (quoc lan)) anh ((di cua) OR (dai cua)) triet*.