Perhaps you should try some spelling variations:
nang hai » hang hai, nang tai, dang hai
su sach » so sach, vu sach
hai cua » thai cua, dai cua, hoi cua
da nang » cam nang, kha nang, cao nang
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, 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: su sach ty hang ((ma hoi) or (mai hoi)). hieu ((ve cham) OR (vu cham)) xuc da nang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ((ma hoi) OR (mai hoi)). hieu ((ve cham) OR (vu cham)) xuc da nang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang ((ma hoi) or (mai hoi)). hieu ((ve cham) OR (vu cham)) xuc da nang hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ((ma hoi) or (mai hoi)). hieu ((ve cham) OR (vu cham)) xuc da nang hai cua tre*.