Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
doi nang » dai nang, hoi nang, voi nang
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hanh va » hang va
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 doi nang ma hoi. hieu ve pham duc va ((hang tai) or (((hanh va) or (hanh vi)))) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi nang ma hoi. hieu ve pham duc va ((hang tai) OR (((hanh va) OR (hanh vi)))) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach doi nang ma hoi. hieu ve pham duc va ((hang tai) or (((hanh va) or (hanh vi)))) cuu tre*.