Perhaps you should try some spelling variations:
thuoc bao » thuoc bo, thuoc ban, thuoc bat
thanh dai » thanh hai, thanh tai, thanh dat
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
bao ky » cao ky, ban ky, bac ky
luc va » duc va, tuc va
loc va » hoc va
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc bao ky ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) or (loc va)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc bao ky ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) OR (loc va)) thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc bao ky ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) or (loc va)) thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc bao ky ((nang xa) OR (nang x)) hoi. hieu ve cau ((luc va) or (loc va)) thanh dai cua tre*.