Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
vanh dai » van dai, vanh tai, lanh dao
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
va vanh » va van, va danh, va hanh
cua tre » cuu tre, cua triet, dua tren
dac va » duc va, day va, dat va
cua te » cua tu

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 y ((lang van) or (dang van)) hoi. hieu va cac dac va vanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh y ((lang van) OR (dang van)) hoi. hieu va cac dac va vanh dai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: hoc nganh y ((lang van) or (dang van)) hoi. hieu va cac dac va vanh dai ((cua tre) or (cua te))*.