Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tri » thanh tri, hanh trinh, hanh triet
hieu van » hieu va, thien van, lieu va
doc thuc » hoc thuc, do thuc, hoc thuoc
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
van doc » van duoc, van hoc, van loc
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang

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 lang xa hoi. hieu van doc thuc va ((hanh tri) OR (hanh tai)) ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. hieu van doc thuc va ((hanh tri) or (hanh tai)) ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu van doc thuc va ((hanh tri) or (hanh tai)) ((cua tre) OR (cua triet))*.