Perhaps you should try some spelling variations:
gian cua » gian xu, ban cua
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
gia cua » giau cua, gia cuc, nghia cua
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va hanh ((gia cua) OR (gian cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang x hoi. hieu ve cac duc va hanh ((gia cua) OR (gian cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va hanh ((gia cua) OR (gian cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va hanh ((gia cua) OR (gian cua)) triet*.