Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
su sach » so sach, vu sach
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
bo sach » co sach, hoc sach
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (bo sach)) ky lang xa hoi. hieu ve ((nam thuoc) or (nam thu)) va hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) ky lang xa hoi. hieu ve ((nam thuoc) OR (nam thu)) va hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) ky lang xa hoi. hieu ve ((nam thuoc) or (nam thu)) va hang di cua tre*.