Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
kham cuu » cham cuu, khao cuu, kham chua
su triet » su viet, su tien
van hanh » van thanh, ban hanh, van anh
ve triet » va trien
hieu vu » hieu va, hieu su, dieu vu
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ly nang xa hoi. ((hieu vu) OR (hieu ve)) kham cuu van hanh vi ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ly nang xa hoi. ((hieu vu) OR (hieu ve)) kham cuu van hanh vi ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ly nang xa hoi. ((hieu vu) OR (hieu ve)) kham cuu van hanh vi ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ly nang xa hoi. ((hieu vu) OR (hieu ve)) kham cuu van hanh vi ((su triet) or (ve triet))*.