Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thuc van » thuc vat, thuc dan, thuc hanh
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc dan, thuc day
sac ky » cac ky, sai ky
he nam » ha nam, nghe nam
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sac ky)) nang xa hoi. hieu he nam ((thuc van) OR (thuc va)) thanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sac ky)) nang xa hoi. hieu he nam ((thuc van) OR (thuc va)) thanh dai cua te~".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sac ky)) nang xa hoi. hieu he nam ((thuc van) OR (thuc va)) thanh dai cua te*.