Perhaps you should try some spelling variations:
quan thuc » luan thuc, qua thuc, quan chuc
thuc day » thuc dan, thuc vat
day manh » van manh, duc manh, ha manh
cau treo » cau tren, cau triet, cau trieu
cau theo » cau thi, cau tao
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
manh va » hanh va, anh va, minh va
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu qua quan thuc day manh va ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu qua quan thuc day manh va ((cau treo) OR (cau theo)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu qua quan thuc day manh va ((cau treo) or (cau theo))*.