Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cham luc » cham soc, nhan luc, cham cuu
hanh dat » thanh dat, anh dat, hanh cat
hieu va » lieu va, hieu qua
va cham » va chat, va tham
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
su sach » vu sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
luc va » duc va, tuc va, loc va
dat su » sat su

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