Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
chat luc » chat xuc, chat lua, chat huu
nhan luc » nang luc
tai cua » thai cua, tai cuc, tri cua
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ty tang » tay tang, ty hang, ky tang
cua tre » cua te, cuu tre, cua triet

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 ((ty tang) OR (ty xang)) ma hoa. hieu va ((chat luc) or (nhan luc)) ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (ty xang)) ma hoa. hieu va ((chat luc) OR (nhan luc)) ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty tang) OR (ty xang)) ma hoa. hieu va ((chat luc) or (nhan luc)) ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) OR (ty xang)) ma hoa. hieu va ((chat luc) or (nhan luc)) ban thanh tai cua tre*.