Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
dua tren » dung tren
van hanh » van thanh, ban hanh, van anh
qua cham » qua hai, qua cac, va cham
qua cam » qua cac, qua ca, qua cai
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang
tu sach » thu sach, su sach, te sach

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

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