Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
thuoc va » thuc va, thuoc ma, thuong va
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
7 tang » 6 tang
v tang » 6 tang, 5 tang, 9 tang
ve lam » va lam, de lam, se lam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((v tang) OR (7 tang)) ma hoi. hieu ve lam thuoc va ((hanh tai) or (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((v tang) OR (7 tang)) ma hoi. hieu ve lam thuoc va ((hanh tai) OR (hang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((v tang) OR (7 tang)) ma hoi. hieu ve lam thuoc va ((hanh tai) or (hang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((v tang) OR (7 tang)) ma hoi. hieu ve lam thuoc va ((hanh tai) or (hang tai)) cua tre*.