Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
hang hai » hoang hai, hang tai, thanh hai
va hang » van hang, va nang, va lang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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) or (vu bach)) ky nang ma hoi. hieu va cam xuc va hang hai ((cau treo) OR (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ky nang ma hoi. hieu va cam xuc va hang hai ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) ky nang ma hoi. hieu va cam xuc va hang hai ((cau treo) OR (cau theo))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) ky nang ma hoi. hieu va cam xuc va hang hai ((cau treo) OR (cau theo))*.