Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
te sach » toc sach
vien da » vien dai, hien dai
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, truc va, duc va
dau vi » dau ve, dau va, dat vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. hieu vien da ((tuc va) or (tuc xa)) dau vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu vien da ((tuc va) OR (tuc xa)) dau vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu vien da ((tuc va) or (tuc xa)) dau vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu vien da ((tuc va) or (tuc xa)) dau vi ((cua triet) OR (va triet))*.