Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, bac trung
cua triet » cua viet, va triet
hanh vai » hanh vi, hanh va, hanh tai
trung va » truong va, trang va, trung ha
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
sai ky » sac ky

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) or (sai ky)) nang xa hoi. hieu va cac trung va hanh vai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sai ky)) nang xa hoi. hieu va cac trung va hanh vai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sai ky)) nang xa hoi. hieu va cac trung va hanh vai ((cua triet) or (su triet))*.