Perhaps you should try some spelling variations:
chu treo » cau treo, cu tren, cau tren
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
hai chu » hai chau, hoi chu, hai chi
dan hai » doan hai, dang hai, dan khai
so sach » so sanh, bo sach, co sach
hieu va » lieu va
nang ma » tang ma, sang ma, nang cao
cam tuc » cam xuc, cam tu, dam thuc
va dan » ca dan, va dao, va dau
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) OR (nam 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) OR (nam 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) OR (nam 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) OR (nam thuc)) va dan hai chu treo*.