Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
doan hai » doanh tai, hoang hai, doan va
nam truc » nam truoc, nam thuc, nam trung
cam truc » cau truc, lam truoc, nam truoc
sach ly » sach y, sach lo, sach ty
dan hai » dang hai, dan khai, van hai
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
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 ly nang ma hoi. hieu va ((cam truc) OR (nam truc)) va ((dan hai) or (doan hai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ma hoi. hieu va ((cam truc) OR (nam truc)) va ((dan hai) OR (doan hai)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly nang ma hoi. hieu va ((cam truc) OR (nam truc)) va ((dan hai) or (doan hai)) cau treo".
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ma hoi. hieu va ((cam truc) OR (nam truc)) va ((dan hai) or (doan hai)) cau treo*.