Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
cham luc » cham soc, nhan luc, cham cuu
hieu su » hieu sau, tieu su, hieu so
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
tu sach » su sach, te sach, tu cach
hieu vu » hieu va, hieu ve, dieu vu
nang xa » nang x, lang xa, nang ma
ha nang » kha nang, hoa nang, da nang
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ha nang xa hoi. ((hieu vu) OR (hieu su)) cham luc va danh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ha nang xa hoi. ((hieu vu) OR (hieu su)) cham luc va danh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ha nang xa hoi. ((hieu vu) OR (hieu su)) cham luc va danh di cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ha nang xa hoi. ((hieu vu) OR (hieu su)) cham luc va danh di cua viet*.