Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
tai khoa » da khoa, noi khoa
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
vi cau » va cau, ve cau, di cau
su sac » su sach, su cac, su xac
tuc va » thuc va, tuc xa, duc va
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va hai » van hai, va chai, va khai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((ma hoi) or (tai khoa)). hieu va hai ((tuc va) OR (truc va)) hanh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((ma hoi) OR (tai khoa)). hieu va hai ((tuc va) OR (truc va)) hanh vi cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((ma hoi) or (tai khoa)). hieu va hai ((tuc va) OR (truc va)) hanh vi cau treo".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((ma hoi) or (tai khoa)). hieu va hai ((tuc va) OR (truc va)) hanh vi cau treo*.