Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh di » dinh du, dinh vi, danh di
va dinh » van dinh, va kinh, va tinh
hieu su » hieu sau, tieu su, hieu so
hieu vu » hieu va, hieu ve, dieu vu
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sach v » sach va, sach y, sach 2
cham o » cham soc
di cuu » di cau, di cua, dinh cuu
o va » do va, so va, co va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v ((nang xa) OR (lang xa)) hoi. ((hieu vu) or (hieu su)) cham o va dinh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v ((nang xa) OR (lang xa)) hoi. ((hieu vu) OR (hieu su)) cham o va dinh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v ((nang xa) OR (lang xa)) hoi. ((hieu vu) or (hieu su)) cham o va dinh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach v ((nang xa) OR (lang xa)) hoi. ((hieu vu) or (hieu su)) cham o va dinh di cuu tre*.