Perhaps you should try some spelling variations:
loai nang » loai nam, luan nang, loai san
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
lo nang » ho nang, ly nang, cao nang
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
x hoi » xa hoi, o hoi, x ho

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 ((lo nang) OR (loai nang)) x hoi. thien van cam ((duc va) or (truc va)) hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((lo nang) OR (loai nang)) x hoi. thien van cam ((duc va) OR (truc va)) hanh dai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((lo nang) OR (loai nang)) x hoi. thien van cam ((duc va) or (truc va)) hanh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((lo nang) OR (loai nang)) x hoi. thien van cam ((duc va) or (truc va)) hanh dai cua viet*.