Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
hau loc » huu loc, phau hoc
cau luc » cau truc, cau phuc
nang xa » nang x, lang xa, nang ma
sac ky » cac 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 ((sac ky) OR (sai ky)) nang xa hoi. hieu van ((cau luc) or (hau loc)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) nang xa hoi. hieu van ((cau luc) OR (hau loc)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) OR (sai ky)) nang xa hoi. hieu van ((cau luc) or (hau loc)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) OR (sai ky)) nang xa hoi. hieu van ((cau luc) or (hau loc)) va hanh dai cua tre*.