Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, lieu va
chat cuu » chat huu, cham cuu, cap cuu
chat cua » nhat cua, chat va, chat huu
hanh dai » hanh tai, hanh dao, thanh dat
vanh dai » van dai, vanh tai, lanh dao
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
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: tu sac ky nang cau hoi. hieu van ((chat cuu) OR (chat cua)) ban ((hanh dai) or (vanh dai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cau hoi. hieu van ((chat cuu) OR (chat cua)) ban ((hanh dai) OR (vanh dai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cau hoi. hieu van ((chat cuu) OR (chat cua)) ban ((hanh dai) or (vanh dai)) cua tre*".