Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
vien cac » vien bach, vien dai, vien da
thanh de » thanh ve, thanh do, thanh le
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve, hanh kem
su sach » so sach, vu sach
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: su sach ky nang x hoi. hieu ((va cam) or (vien cac)) thuc day ((thanh de) OR (hanh de)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((va cam) OR (vien cac)) thuc day ((thanh de) OR (hanh de)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((va cam) or (vien cac)) thuc day ((thanh de) OR (hanh de)) va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((va cam) or (vien cac)) thuc day ((thanh de) OR (hanh de)) va triet*.