Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
cam truc » cau truc, nam truc, nam truoc
va triet » va thiet, va trien, ve triet
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((y nang) OR (v nang)) xa hoi. hieu qua ((cam truc) or (lam truoc)) va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (v nang)) xa hoi. hieu qua ((cam truc) OR (lam truoc)) va hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((y nang) OR (v nang)) xa hoi. hieu qua ((cam truc) or (lam truoc)) va hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) OR (v nang)) xa hoi. hieu qua ((cam truc) or (lam truoc)) va hanh vi va triet*.