Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
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
sach ly » sach y, sach lo, sach ty
lai hoi » dai hoi, lai hoa, lai roi
ly nang » ky nang, ly hang, ly vang
va cam » va cham, va cac, va cao
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 ly nang ((mai khoi) 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 ly nang ((mai khoi) 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 ly nang ((mai khoi) or (lai hoi)). hieu va cam duc va hanh hai ((cua tre) or (cua te))*.