Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
nang cai » nang cao, nang tai, nang cap
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
cai hoi » cau hoi, dai hoi, cai hoa
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

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