Perhaps you should try some spelling variations:
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
tinh di » tinh doi, trinh di, tinh da
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang xa) or (dang xay)) hoi. hieu va cam ((xuc va) OR (luc va)) tinh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (dang xay)) hoi. hieu va cam ((xuc va) OR (luc va)) tinh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang xa) or (dang xay)) hoi. hieu va cam ((xuc va) OR (luc va)) tinh di cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) or (dang xay)) hoi. hieu va cam ((xuc va) OR (luc va)) tinh di cua te*.