Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vanh dai » van dai, vanh tai, lanh dao
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky dang xa hoi. hieu ve cam ((((tuc va) or (thuc day))) or (tuc xa)) vanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang xa hoi. hieu ve cam ((((tuc va) OR (thuc day))) OR (tuc xa)) vanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang xa hoi. hieu ve cam ((((tuc va) or (thuc day))) or (tuc xa)) vanh dai cua viet*.