Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cau tren » cu tren, dau tren, ca tren
dang van » hoang van, hang va
vien cac » vien bach, vien dai, vien da
lang xa » lang ha, dang xay, lang van
cac loc » cac lop, cac toc, cac hoc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
san ky » sang ky, van ky, dan ky
loc va » hoc va, luc va
cua te » cua tu
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((lang xa) or (dang van)) hoi. hieu vien cac loc va danh vi ((cua te) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((lang xa) OR (dang van)) hoi. hieu vien cac loc va danh vi ((cua te) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu san ky ((lang xa) or (dang van)) hoi. hieu vien cac loc va danh vi ((cua te) or (cau tren))*.