Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
duc manh » suc manh, duc anh, duc minh
cau treo » cau theo, cau triet, cau trieu
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach ty, sach kem
cam duc » cam xuc, cao duc, pham duc
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 ((cau tren) or (cau treo))~.
• 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 ((cau tren) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sach y)) lang xa hoi. hieu van cam duc manh hanh vi ((cau tren) or (cau treo))*.