Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
lang van » dang van, tang van, hoang van
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
ve cac » va cac, vien cac
toc va » toc ta, tuc va, loc va
sac ky » cac ky, sai ky
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: te sac ky ((nang xa) or (lang van)) hoi. hieu ve cac ((toc va) OR (hoc va)) thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (lang van)) hoi. hieu ve cac ((toc va) OR (hoc va)) thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (lang van)) hoi. hieu ve cac ((toc va) OR (hoc va)) thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (lang van)) hoi. hieu ve cac ((toc va) OR (hoc va)) thanh vai cua te*.