Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
su triet » su viet, ve triet
toc sac » toc sach, toc san, doc sach
cua lao » cu lao, ca lao, cua dao
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
lao va » tao va, cao va, bao va
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) or (hoc sach)) ky nang xa hoi. hieu ve cua lao va hanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (hoc sach)) ky nang xa hoi. hieu ve cua lao va hanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: ((toc sac) or (hoc sach)) ky nang xa hoi. hieu ve cua lao va hanh vi ((su triet) or (su tien))*.