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
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
cua tre » cua te, cuu tre, dua tren
ve cac » va cac, vien cac
tac va » tac da, tac xa, tuc va
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 nang xa hoi. hieu ve cac tac va dan vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve cac tac va dan vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve cac tac va dan vi ((cua tre) or (cua triet))*.