Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
hieu va » lieu va
con cua » cong cua, co cua, dong cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang x hoi. ((hieu va) or (hieu qua)) con cua ban thanh tai ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu va) OR (hieu qua)) con cua ban thanh tai ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu va) or (hieu qua)) con cua ban thanh tai ((cua tre) or (cau tren))*.