Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
nam thue » nam thu, nam thuc, lam thue
ly nang » ky nang, ly hang, ly vang
thue va » thuc va, thuyet va, thuc vat
danh de » dan de, dang de, danh di
hanh de » hanh ve, hanh kem
tu sach » thu sach, su sach, te sach
y nang » ky nang, v nang, may nang
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: tu sach ((y nang) OR (ly nang)) x hoi. hieu van nam thue va ((danh de) or (hanh de)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) x hoi. hieu van nam thue va ((danh de) OR (hanh de)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) x hoi. hieu van nam thue va ((danh de) or (hanh de)) va triet*".