Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va hanh » va thanh, va danh, ban hanh
cau tre » cau tren, cau treo, cau tra
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac

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 y nang xa hoi. hieu van ((pham duc) or (cam xuc)) ((va hanh) OR (van hanh)) ve cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van ((pham duc) OR (cam xuc)) ((va hanh) OR (van hanh)) ve cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu van ((pham duc) or (cam xuc)) ((va hanh) OR (van hanh)) ve cau tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van ((pham duc) or (cam xuc)) ((va hanh) OR (van hanh)) ve cau tre*.