Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ve cac » va cac
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
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: tu sach y nang ma hoi. hieu ((ve cac) or (vien cac)) ((xuc va) OR (luc va)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu ((ve cac) OR (vien cac)) ((xuc va) OR (luc va)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu ((ve cac) or (vien cac)) ((xuc va) OR (luc va)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu ((ve cac) or (vien cac)) ((xuc va) OR (luc va)) thanh vi cua te*.