Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
hieu va » lieu va, hieu qua
cham lo » cham o, cam lo, cham soc
cuu tre » cua tre, cau tren, cau treo
y tang » ky tang, 6 tang, 7 tang
nam lo » nam bo, nam so, nam co
ma hoi » mai hoi, ma hoa, me hoi
va cuu » va cau, va chu, va huu

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 (xa hoi)). hieu va ((cham lo) or (nam lo)) va tinh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang ((ma hoi) OR (xa hoi)). hieu va ((cham lo) OR (nam lo)) va tinh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y tang ((ma hoi) OR (xa hoi)). hieu va ((cham lo) or (nam lo)) va tinh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ((ma hoi) OR (xa hoi)). hieu va ((cham lo) or (nam lo)) va tinh va cuu tre*.