Perhaps you should try some spelling variations:
cham luc » nhan luc, cham cuu, chat lua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
cai hoa » cau hoa, cam hoa, dai hoa
y nang » ky nang, ly nang, v nang
va dau » va dao
ca hoa » cau hoa, cam hoa, ma hoa

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 y nang xa hoi. hieu vu ((cham luc) or (cham soc)) va dau ((ca hoa) OR (cai hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu vu ((cham luc) OR (cham soc)) va dau ((ca hoa) OR (cai hoa)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu vu ((cham luc) or (cham soc)) va dau ((ca hoa) OR (cai hoa)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu vu ((cham luc) or (cham soc)) va dau ((ca hoa) OR (cai hoa)) viet*.