Perhaps you should try some spelling variations:
loai nang » loai nam, luan nang, loai san
hieu van » hieu va, thien van, lieu va
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua dieu
tu sach » thu sach, su sach, te sach
lo nang » ho nang, ly nang, cao nang
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
van am » van nam, van lam, van dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((lo nang) or (loai nang)) ma hoi. hieu van am thuc van hanh di ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo nang) OR (loai nang)) ma hoi. hieu van am thuc van hanh di ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo nang) or (loai nang)) ma hoi. hieu van am thuc van hanh di ((cua viet) or (cua vat))*.