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 » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
cua te » cua tu

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 ((mai hoi) OR (lai hoi)). hieu va cam duc va hanh hai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((mai hoi) OR (lai hoi)). hieu va cam duc va hanh hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((mai hoi) OR (lai hoi)). hieu va cam duc va hanh hai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((mai hoi) OR (lai hoi)). hieu va cam duc va hanh hai ((cua tre) or (cua te))*.