Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
cuu tre » cua tre, cau treo
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau

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 ky) OR (sach ty)) nang ma hoa. hieu van cam duc va hanh vai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang ma hoa. hieu van cam duc va hanh vai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang ma hoa. hieu van cam duc va hanh vai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang ma hoa. hieu van cam duc va hanh vai ((cuu tre) or (cau tren))*.