Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
tran anh » tran manh, tuan anh, tran thanh
hieu van » hieu va, thien van, lieu va
tan anh » tuan anh, toan anh, van anh
tu cach » tu cac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (vu sach)) ky lang xa hoi. hieu van nam thuoc ((tan anh) OR (tran anh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (vu sach)) ky lang xa hoi. hieu van nam thuoc ((tan anh) OR (tran anh)) va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (vu sach)) ky lang xa hoi. hieu van nam thuoc ((tan anh) OR (tran anh)) va cua tre*".