Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, v nang, may nang
ve cam » ve cham, ve cac, va cam
sua va » suat va, vua va, xua va
thiet » thieu

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