Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
tu sach » thu sach, su sach, te sach
vat cuu » vat cua
dau vat » dau va, bau vat, dan vat
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
ty hang » ly hang, thi hang, thu hang
cuu tre » cua tre, cau tren, cau treo
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty xang) or (ty hang)) xa hoi. hieu ve ((cam tuc) or (nam thuoc)) va dau vat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty xang) OR (ty hang)) xa hoi. hieu ve ((cam tuc) OR (nam thuoc)) va dau vat cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty xang) or (ty hang)) xa hoi. hieu ve ((cam tuc) or (nam thuoc)) va dau vat cuu tre*.