Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach ty, sach kem
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
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: thuoc ((sach ky) or (sach y)) lang xa hoi. hieu van cam duc manh hanh vi ((cuu tre) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sach y)) lang xa hoi. hieu van cam duc manh hanh vi ((cuu tre) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sach y)) lang xa hoi. hieu van cam duc manh hanh vi ((cuu tre) or (cau triet))*.