Perhaps you should try some spelling variations:
cac truc » cau truc, cac trung, sach truc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac tru » ca tru, cac tro, cac thu
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua, dong cua
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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