Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
cua triet » cua viet, su triet
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
bac tuc » bac tu, bac thua
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach

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 ky nang xa hoi. hieu van ((bac tuc) or (bach tuoc)) va hanh tai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van ((bac tuc) OR (bach tuoc)) va hanh tai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu van ((bac tuc) or (bach tuoc)) va hanh tai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van ((bac tuc) or (bach tuoc)) va hanh tai ((cua triet) OR (va triet))*.