Perhaps you should try some spelling variations:
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
van pham » van phan, van phat, van tham
ban hanh » ban hang
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
cuc ban » cua ban, cac ban, cuu ban
hoi cua » hoi chuc
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tri nang cao hoi. hieu ((van pham) OR (san pham)) cuc ban hanh ((di cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tri nang cao hoi. hieu ((van pham) OR (san pham)) cuc ban hanh ((di cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tri nang cao hoi. hieu ((van pham) OR (san pham)) cuc ban hanh ((di cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach tri nang cao hoi. hieu ((van pham) OR (san pham)) cuc ban hanh ((di cua) or (hoi cua)) tre*.