Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ky trong » ly trong, ke trong, cay trong
tao khoi » tao hoi, thao khoa, lao khoa
duc gia » quoc gia
lap cua » tap cua, lam cua, ap cua
lai cua » dai cua, hai cua, lai chau
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky nang) or (ky trong)) tao khoi. hieu v pham duc gia thanh ((lap cua) OR (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky nang) OR (ky trong)) tao khoi. hieu v pham duc gia thanh ((lap cua) OR (lai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky nang) or (ky trong)) tao khoi. hieu v pham duc gia thanh ((lap cua) OR (lai cua)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky nang) or (ky trong)) tao khoi. hieu v pham duc gia thanh ((lap cua) OR (lai cua)) te*.