Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
van hanh » van thanh, van ban, van minh
ban hanh » ban hang
hang co » hang cho, hang ca, nang co
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
van anh » van thanh, tuan anh, van minh
cua chu » sua chua
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: doc sach thi hang co hoc. hieu qua cac xuc ((((van hanh) or (van anh))) or (ban hanh)) di cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach thi hang co hoc. hieu qua cac xuc ((((van hanh) OR (van anh))) OR (ban hanh)) di cua chu*.