Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh tai » thanh tai, hang tai, hinh tai
thi nang » thi cong, ki nang, thi hanh
nam thuc » nam thuoc, am thuc, nam thu
sach thi » sach thu, sach tai, sach thieu
han tai » hang tai, nhan tai, van tai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve nam » he nam, va nam, le nam

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: tu sach thi nang xa hoi. hieu ve nam thuc va ((hanh tai) OR (han tai)) ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang xa hoi. hieu ve nam thuc va ((hanh tai) OR (han tai)) ((cua triet) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang xa hoi. hieu ve nam thuc va ((hanh tai) OR (han tai)) ((cua triet) or (su triet))*.