Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
ve cac » va cac
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. hieu ((ve cac) OR (vien cac)) truc va ((hanh de) OR (hanh kem)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang xa hoi. hieu ((ve cac) OR (vien cac)) truc va ((hanh de) or (hanh kem)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. hieu ((ve cac) OR (vien cac)) truc va ((hanh de) or (hanh kem)) cua tu*.