Perhaps you should try some spelling variations:
dang hoai » dang hai, dang loai, dung hoai
thu sach » tu sach, thuat sach, thuoc sach
thuc day » thuc dan, thuc vat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan
hoai ca » hoai cai, hoai va, loai ca
ve nam » he nam, va nam, le nam
ca tre » ca tren, cua tre, ca tru

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang xa hoi. hieu ve nam ((thuc va) or (thuc day)) dang hoai ca tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu ve nam ((thuc va) OR (thuc day)) dang hoai ca tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ve nam ((thuc va) or (thuc day)) dang hoai ca tre*.