Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau
cam loc » cam lo
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, va danh
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang x hoi. hieu van cam loc ((va hanh) or (ban thanh)) sua ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang x hoi. hieu van cam loc ((va hanh) OR (ban thanh)) sua ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ly nang x hoi. hieu van cam loc ((va hanh) or (ban thanh)) sua ((va triet) or (va thiet))*.