Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
luu tre » luu tru, cuu tre, luy tre
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
bac va » ban va, bac ha, bao va
tuc va » thuc va, truc va, tuc xa
vi luu » vi lua
ve cam » ve cham, ve cac, va cam

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 ky ((nang xa) OR (nang ma)) hoi. hieu ve cam ((bac va) OR (tuc va)) hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cam ((bac va) OR (tuc va)) hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cam ((bac va) OR (tuc va)) hanh vi luu tre*.