Perhaps you should try some spelling variations:
lang mai » lang dai, lang hai, lang man
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
luc va » tuc va, loc va
vi cua » vai cua, di cua

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) or (do sanh)) ky lang mai hoi. hieu va cao ((duc va) or (luc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (do sanh)) ky lang mai hoi. hieu va cao ((duc va) OR (luc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (do sanh)) ky lang mai hoi. hieu va cao ((duc va) or (luc va)) hanh vi cua tre*.