Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
lai cua » dai cua, hai cua, lai chau
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
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 (sac ky)) nang x hoi. hieu ve cac ((xuc va) OR (duc va)) hanh lai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu ve cac ((xuc va) OR (duc va)) hanh lai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang x hoi. hieu ve cac ((xuc va) OR (duc va)) hanh lai cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. hieu ve cac ((xuc va) OR (duc va)) hanh lai cua vat*.