Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thanh ve » hanh ve, thanh va, thanh vien
nang cau » nang cao, hang cau, nang dau
truc va » thuc va, trung va
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
v nang » va nang, vu nang, van nang
ve cua » le cua, de cua, te cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) v nang cau hoi. hieu ve cam ((truc va) OR (thuc vat)) thanh ve cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) v nang cau hoi. hieu ve cam ((truc va) OR (thuc vat)) thanh ve cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) v nang cau hoi. hieu ve cam ((truc va) OR (thuc vat)) thanh ve cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) v nang cau hoi. hieu ve cam ((truc va) OR (thuc vat)) thanh ve cua viet*.