Perhaps you should try some spelling variations:
vien dai » hien dai
vien cac » vien bach, vien da, gian cac
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
day cua » dai cua
dat cua » dai cua, mat cua, dan cua
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. hieu ((vien cac) OR (vien dai)) duc va thanh ((dat cua) or (day cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. hieu ((vien cac) OR (vien dai)) duc va thanh ((dat cua) OR (day cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. hieu ((vien cac) OR (vien dai)) duc va thanh ((dat cua) or (day cua)) tre*".