Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
luat tre » luat tri, luat thue, luat ve
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
bao xuc » bao luc, bao thuc
va hanh » van hanh, va danh, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang xa hoi. ((hieu van) OR (hieu va)) bao xuc ((va hanh) or (va thanh)) trinh luat tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang xa hoi. ((hieu van) OR (hieu va)) bao xuc ((va hanh) OR (va thanh)) trinh luat tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky nang xa hoi. ((hieu van) OR (hieu va)) bao xuc ((va hanh) or (va thanh)) trinh luat tre".
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang xa hoi. ((hieu van) OR (hieu va)) bao xuc ((va hanh) or (va thanh)) trinh luat tre*.