Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nganh xay » nganh mac, nganh y, nganh ma
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
va hang » van hang, va nang, va hanh
hai cuu » hai cua, hai chu, hai cuc
va lang » va nang, hoa lang
cuu tre » cua tre, cau tren, cau treo
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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) or (dang van)) hoi. hieu ve cac duc ((va hang) OR (va lang)) hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh xay ((lang van) OR (dang van)) hoi. hieu ve cac duc ((va hang) OR (va lang)) hai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh xay ((lang van) or (dang van)) hoi. hieu ve cac duc ((va hang) OR (va lang)) hai cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc nganh xay ((lang van) or (dang van)) hoi. hieu ve cac duc ((va hang) OR (va lang)) hai cuu tre*.