Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
ty dang » ty xang, ty hang, ty dong
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
hai cuc » hai cua, thai cua, hai huoc
luc va » duc va, tuc va, loc va

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 ((ty dang) or (ky dang)) cau hoi. hieu va chat luc va thanh ((hai cuc) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty dang) OR (ky dang)) cau hoi. hieu va chat luc va thanh ((hai cuc) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty dang) or (ky dang)) cau hoi. hieu va chat luc va thanh ((hai cuc) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty dang) or (ky dang)) cau hoi. hieu va chat luc va thanh ((hai cuc) OR (tai cuc)) tre*.