Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vinh cuu » dinh cuu, sinh cua, dinh cu
hoc sach » hoc sinh, hoc cac, hoc anh
anh vinh » danh vinh, anh kinh, anh dinh
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
lo van » vo van, so van, do van

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) or (hoc sach)) ky lang xa hoi. hieu ve cac ((lo van) or (le van)) anh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (hoc sach)) ky lang xa hoi. hieu ve cac ((lo van) OR (le van)) anh vinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (hoc sach)) ky lang xa hoi. hieu ve cac ((lo van) or (le van)) anh vinh cuu tre*.