Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
tu sach » thu sach, te sach, tu cach
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
su sach » so sach, vu sach
luu tre » luu tru, cuu tre, luy tre
luc va » duc va, tuc va, loc va
vi luu » vi lua

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 (su sach)) ((ty nang) or (ty hang)) xa hoi. hieu va chat luc va dinh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((ty nang) OR (ty hang)) xa hoi. hieu va chat luc va dinh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ((ty nang) or (ty hang)) xa hoi. hieu va chat luc va dinh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ((ty nang) or (ty hang)) xa hoi. hieu va chat luc va dinh vi luu tre*.