Perhaps you should try some spelling variations:
so nganh » so ngan, hoc nganh, moi nganh
van hanh » van thanh, ban hanh, van anh
nganh ky » nganh y, nganh xay, hanh ky
cau tren » cu tren, dau tren, ca tren
lang ha » long ha
lang xa » dang xay, lang van
cuu tre » cua tre, cau treo
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
du van » duy van, duc van, tu van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so nganh ky ((lang xa) OR (lang ha)) hoi. hieu ve cac du van hanh vi ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so nganh ky ((lang xa) or (lang ha)) hoi. hieu ve cac du van hanh vi ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: so nganh ky ((lang xa) or (lang ha)) hoi. hieu ve cac du van hanh vi ((cuu tre) OR (cau tren))*.