Perhaps you should try some spelling variations:
nam truoc » nam thuoc, lam truoc, nam truong
hieu van » hieu va, thien van, lieu va
nam truc » nam thuc, nam trung, nam thuoc
ban hanh » ban hang
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
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 sac ky nang x hoi. hieu van ((((nam truc) OR (nam truoc))) or (nam thu)) ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu van ((((nam truc) OR (nam truoc))) OR (nam thu)) ban hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu van ((((nam truc) OR (nam truoc))) or (nam thu)) ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu van ((((nam truc) OR (nam truoc))) or (nam thu)) ban hanh di cua tre*.