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

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 cham ((bac va) or (truc va)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cham ((bac va) OR (truc va)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) or (nang ma)) hoi. hieu ve cham ((bac va) or (truc va)) hanh vi luu tre*.