Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, dua tren
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang xa hoi. hieu ve cac tuc va dan vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ve cac tuc va dan vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ve cac tuc va dan vi ((cua tre) or (cua triet))*.