Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
ta danh » tac danh, tao danh, tap danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
toc ta » toc tay, toc thai
ve cac » va cac

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 ky nang xa hoi. hieu ((ve cac) or (vien cac)) toc ta danh ((vai cua) OR (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) toc ta danh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) toc ta danh ((vai cua) OR (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) toc ta danh ((vai cua) OR (lai cua)) tre*.