Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
phan duc » pham duc, phan tu, phan dau
su sach » so sach, vu sach
hanh va » hang va, hanh vi
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
cua tre » cua te, cuu tre, cua triet

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 ((tu lang) or (xu lang)) xa hoi. hieu ve phan duc va ((hanh lai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu lang) OR (xu lang)) xa hoi. hieu ve phan duc va ((hanh lai) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((tu lang) or (xu lang)) xa hoi. hieu ve phan duc va ((hanh lai) or (hanh va)) cua tre*.