Perhaps you should try some spelling variations:
dang khai » dang khoi, dang hai, quang khai
cau treo » cau theo, cau tren, cau triet
dan khai » van khai, dang khoi, doan khac
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa
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: su sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va ((dan khai) OR (dang khai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc va ((dan khai) OR (dang khai)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va ((dan khai) OR (dang khai)) cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam tuc va ((dan khai) OR (dang khai)) cau treo*.