Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
y tang » ky tang, 6 tang, 7 tang
cam lo » nam lo, cam ly, cam o
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y tang ((ma hoi) or (ma hoa)). hieu ve ((cham soc) or (cam lo)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang ((ma hoi) OR (ma hoa)). hieu ve ((cham soc) OR (cam lo)) va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ((ma hoi) or (ma hoa)). hieu ve ((cham soc) or (cam lo)) va hanh vai cuu tre*.