Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
cau tren » cu tren, dau tren, ca tren
thu hang » thi hang, thuc hanh, thu huong
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
cuu tre » cua tre, cau treo
so sach » so sanh, bo sach, co sach

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 thu hang xa hoi. hieu ve ((nam thuc) OR (nam thuoc)) van hanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu hang xa hoi. hieu ve ((nam thuc) OR (nam thuoc)) van hanh tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu hang xa hoi. hieu ve ((nam thuc) OR (nam thuoc)) van hanh tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: so sach thu hang xa hoi. hieu ve ((nam thuc) OR (nam thuoc)) van hanh tai ((cuu tre) or (cau tren))*.