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

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 xay 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 xay 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 xay lang ((van hoi) or (van hoe)). hieu ve ((cac duc) or (cac bac)) cam nang thai cua tre*.