Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
nang khoa » hang khoa, dang khoa, nang hoa
khoa hoc » hoa hoc
tu sach » thu sach, su sach, tu cach
va cham » va chat, va tham
tai duc » tai cuc, mai duc, tai du
duc ban » duc tan, duc van, dua ban
duc tre » duoc tren, duc tien
te sach » toc sach
va cam » va cac, va cao, va cai

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) or (te sach)) ky nang khoa hoc. lieu ((va cam) OR (va cham)) duc ban thanh tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang khoa hoc. lieu ((va cam) OR (va cham)) duc ban thanh tai duc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang khoa hoc. lieu ((va cam) OR (va cham)) duc ban thanh tai duc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang khoa hoc. lieu ((va cam) OR (va cham)) duc ban thanh tai duc tre*.