Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
su sach » so sach, vu sach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
duc van » duc va, duc manh, duc phan
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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) or (te sach)) ky nang ma hoa. hieu v pham ((duc van) OR (duc tan)) thanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang ma hoa. hieu v pham ((duc van) OR (duc tan)) thanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang ma hoa. hieu v pham ((duc van) OR (duc tan)) thanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang ma hoa. hieu v pham ((duc van) OR (duc tan)) thanh tai cuu tre*.