Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
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 ty ((nang xa) OR (lang xa)) hoi. hieu ve cam duc va hanh ((lai chau) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cam duc va hanh ((lai chau) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cam duc va hanh ((lai chau) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cam duc va hanh ((lai chau) or (dai cua)) tre*.