Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
cau treo » cau theo, cau tren, cau triet
dua tren » dung tren
va nhanh » va thanh, va hanh, va nhan
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ve cam » ve cham, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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 ky nang ma hoi. hieu ((ve cam) OR (ve cac)) duc va nhanh hai ((dua tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((ve cam) OR (ve cac)) duc va nhanh hai ((dua tren) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu ((ve cam) OR (ve cac)) duc va nhanh hai ((dua tren) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((ve cam) OR (ve cac)) duc va nhanh hai ((dua tren) or (cau treo))*.