Perhaps you should try some spelling variations:
nay thuoc » cay thuoc, nam thuoc, na thuoc
vat thanh » dat thanh, gat thanh, tat thanh
ta thanh » tai thanh, va thanh, ha thanh
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va nay » va ngay, va cay
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (co sach)) ky lang xa hoi. hieu va nay thuoc ((vat thanh) or (ta thanh)) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky lang xa hoi. hieu va nay thuoc ((vat thanh) OR (ta thanh)) dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ky lang xa hoi. hieu va nay thuoc ((vat thanh) or (ta thanh)) dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ky lang xa hoi. hieu va nay thuoc ((vat thanh) or (ta thanh)) dai cua te*.