Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
tu cach » tu cac
quan xa » quan ha, quan va, quan cua
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di 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 cach) or (thu sach)) lien quan xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) lien quan xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) lien quan xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) lien quan xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vi cua viet*.