Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
hoang van » hang va
dang van » hang va
nganh ky » nganh y, nganh xay, hanh ky
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va
cac dac » cac dan, cac dai, cac bac
cua te » cua tu
dac va » duc va, day va, dat va

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 ((dang van) or (hoang van)) hoi. ((hieu ve) OR (hieu van)) cac dac va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky ((dang van) OR (hoang van)) hoi. ((hieu ve) OR (hieu van)) cac dac va hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ky ((dang van) or (hoang van)) hoi. ((hieu ve) OR (hieu van)) cac dac va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky ((dang van) or (hoang van)) hoi. ((hieu ve) OR (hieu van)) cac dac va hanh dai cua te*.