Perhaps you should try some spelling variations:
lang thai » lang chai, dang thai, lang hai
hoc nganh » hoc nhanh
nganh ky » nganh y, nganh xay, hanh ky
lang van » dang van, hoang van, giang van
nang tai » hang tai, tang tai, sang tai
tang van » dang van, hoang van, trong van
cua tre » cua te, cuu tre, cua triet
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 ky ((lang van) OR (tang van)) hoi. hieu ve cac duc va ((lang thai) or (nang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky ((lang van) OR (tang van)) hoi. hieu ve cac duc va ((lang thai) OR (nang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ky ((lang van) OR (tang van)) hoi. hieu ve cac duc va ((lang thai) or (nang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky ((lang van) OR (tang van)) hoi. hieu ve cac duc va ((lang thai) or (nang tai)) cua tre*.