Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nang thai » nang tai, dang thai, lang thai
nganh ky » nganh y, nganh xay, hanh ky
thai cua » than cua, tai cuc, tri cua
cac bac » cac bai, cac ban, cac cach
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
van hoe » van hoa, van hoc, van hieu
van hoi » van hoa, van hoc, van loi
ky lang » ky nang, ky dang, ky tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh ky lang ((van hoi) or (van hoe)). hieu ve ((cac duc) or (cac bac)) cam nang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky lang ((van hoi) OR (van hoe)). hieu ve ((cac duc) OR (cac bac)) cam nang thai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky lang ((van hoi) or (van hoe)). hieu ve ((cac duc) or (cac bac)) cam nang thai cua tre*.