Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » lang xa, nang ma, mang xa
van cau » van dau, van hau, van chat
cau loc » hau loc, cau hoc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky ((nang xa) OR (nang x)) hoi. hieu van cau loc va hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky ((nang xa) OR (nang x)) hoi. hieu van cau loc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky ((nang xa) OR (nang x)) hoi. hieu van cau loc va hanh dai cua tre*.