Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, nhanh ha, nganh hai
thanh hai » thanh phan, thanh hoa, thanh san
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa

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