Perhaps you should try some spelling variations:
cham loc » chon loc, cham o, hau loc
tu sach » thu sach, su sach, tu cach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te sach » toc sach
cu tren » tu tren, dua tren
vi cu » vi su, vi xu, vi du

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 (te sach)) ky dang xa hoi. hieu va ((cham loc) or (cham soc)) va hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky dang xa hoi. hieu va ((cham loc) OR (cham soc)) va hanh vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky dang xa hoi. hieu va ((cham loc) or (cham soc)) va hanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky dang xa hoi. hieu va ((cham loc) or (cham soc)) va hanh vi cu tren*.