Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
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: te sach y ((nang ma) or (nang cao)) hoi. hieu va cam duc va hanh hai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (nang cao)) hoi. hieu va cam duc va hanh hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) or (nang cao)) hoi. hieu va cam duc va hanh hai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (nang cao)) hoi. hieu va cam duc va hanh hai ((cua tre) OR (cuu tre))*.