Perhaps you should try some spelling variations:
van trien » van tien, va trien, van tren
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
sach ty » sach y, sach tu, sach thu
hanh de » hanh ve, hanh kem
vien da » vien dai, hien dai
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, ve cai
de van » le van, do van, ve van
va cam » va cham, va cac, va cao
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: so sach ty nang x hoi. hieu ((((ve cam) or (va cam))) or (vien da)) thuc day hanh de van trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. hieu ((((ve cam) OR (va cam))) OR (vien da)) thuc day hanh de van trien.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. hieu ((((ve cam) or (va cam))) or (vien da)) thuc day hanh de van trien*.