Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
duc manh » suc manh, duc anh, duc minh
hanh lam » thanh lap, hanh kem, hanh va
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
lam su » lai su, lam so, lam vu

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

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