Perhaps you should try some spelling variations:
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
vai cua » hai cua, lai cua, bai cua
ve cac » va cac, vien cac
toc xa » toc ta, hoc xa, tac xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu nang x hoi. hieu ve cac ((toc xa) or (tuc xa)) danh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang x hoi. hieu ve cac ((toc xa) OR (tuc xa)) danh ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang x hoi. hieu ve cac ((toc xa) or (tuc xa)) danh ((vai cua) or (dai cua)) tre*.