Perhaps you should try some spelling variations:
chu treo » cau treo, cu tren, cau tren
sach ky » sac ky, sach y, sach ty
hai chu » hai chau, hoi chu, hai chi
dan hai » doan hai, dang hai, dan khai
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
hieu va » lieu va
nang ma » tang ma, sang ma, nang cao
tuc va » truc va, tuc xa, duc va
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: so sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam ((tuc va) OR (thuc va)) dan hai chu treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cam ((tuc va) OR (thuc va)) dan hai chu treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam ((tuc va) OR (thuc va)) dan hai chu treo".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. ((hieu va) or (hieu qua)) cam ((tuc va) OR (thuc va)) dan hai chu treo*.