Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hanh lam » thanh lap, hanh kem, hanh va
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc van » duc va, duc manh, duc phan
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang xa hoi. hieu va cam ((duc van) or (duc tan)) hanh lam ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu va cam ((duc van) OR (duc tan)) hanh lam ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu va cam ((duc van) or (duc tan)) hanh lam ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu va cam ((duc van) or (duc tan)) hanh lam ((cua triet) OR (su triet))*.