Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
dua ban » dia ban, cua ban, qua ban
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, va cam, ve cai
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 mai khoi. hieu ((ve cam) or (ve cac)) dua ban thanh hoi ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang mai khoi. hieu ((ve cam) OR (ve cac)) dua ban thanh hoi ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang mai khoi. hieu ((ve cam) or (ve cac)) dua ban thanh hoi ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang mai khoi. hieu ((ve cam) or (ve cac)) dua ban thanh hoi ((cuu tre) OR (cau tren))*.