Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
tuc va » truc va, duc va, thuc vat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang xa hoi. hieu ve cam ((((tuc va) OR (thuc va))) or (tuc xa)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang xa hoi. hieu ve cam ((((tuc va) OR (thuc va))) OR (tuc xa)) hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang xa hoi. hieu ve cam ((((tuc va) OR (thuc va))) or (tuc xa)) hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang xa hoi. hieu ve cam ((((tuc va) OR (thuc va))) or (tuc xa)) hanh vai cua viet*.