Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
kho tang » cao tang
su sach » so sach, vu sach
lam cua » nam cua, lam chat
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, ky trong
tuc va » truc va, tuc xa, duc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky tang) OR (kho tang)) mai hoi. hieu ve cam ((tuc va) or (thuc va)) thanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) mai hoi. hieu ve cam ((tuc va) OR (thuc va)) thanh lam cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (kho tang)) mai hoi. hieu ve cam ((tuc va) or (thuc va)) thanh lam cua tre*".