Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau treo » cau tren, cau triet, cau trieu
hanh tai » thanh tai, hang tai, han tai
cau theo » cau thi, cau tao
duc van » duc va, duc tan, duc manh
xang xa » lang xa, mang xa, ang xa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
y xang » ty xang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y xang xa hoi. hieu ((ve cam) OR (ve cac)) duc van hanh tai ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y xang xa hoi. hieu ((ve cam) OR (ve cac)) duc van hanh tai ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y xang xa hoi. hieu ((ve cam) OR (ve cac)) duc van hanh tai ((cau treo) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: thu sach y xang xa hoi. hieu ((ve cam) OR (ve cac)) duc van hanh tai ((cau treo) or (cau theo))*.