Perhaps you should try some spelling variations:
khoa hoi » khoan hoi, khoa hoc, khoa doi
su sach » so sach, vu sach
xa hanh » xa thanh, xa khanh, va hanh
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
sach 7 » sach y, sach 2
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
7 lang » o lang, _ lang
vi cuu » vi luu, vinh cuu

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 7 lang ((ha hoi) or (khoa hoi)). hieu ((ve cam) or (ve cac)) tuc xa hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 lang ((ha hoi) OR (khoa hoi)). hieu ((ve cam) OR (ve cac)) tuc xa hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach 7 lang ((ha hoi) or (khoa hoi)). hieu ((ve cam) or (ve cac)) tuc xa hanh vi cuu tre*.