Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
lang mai » lang dai, lang hai, lang man
vai cua » dai cua, hai cua, lai cua
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
cham o » cham soc
cam lo » nam lo, cam ly, cam o
6 lang » o lang, _ lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) 6 lang mai hoi. hieu van ((cham o) or (cam lo)) va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) 6 lang mai hoi. hieu van ((cham o) OR (cam lo)) va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) 6 lang mai hoi. hieu van ((cham o) or (cam lo)) va thanh vai cua tre*.