Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
va thanh » gia thanh, ban thanh, va tinh
hai cau » hai chau, hai chu, hai hau
va hanh » van hanh, va danh, ban hanh
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
nang ho » nang hoc, nang co, nang cao
tang ho » tang cho, tung ho, tang ha
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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