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
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
xang xa » lang xa, mang xa, ang xa
va cam » va cham, 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: thu sach ty xang xa hoi. hieu ((va cam) OR (va 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 ty xang xa hoi. hieu ((va cam) OR (va 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 ty xang xa hoi. hieu ((va cam) OR (va cac)) duc van hanh tai ((cau treo) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. hieu ((va cam) OR (va cac)) duc van hanh tai ((cau treo) or (cau theo))*.