Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
sach ky » sach y, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) tang xa hoi. hieu van cam tuc va hanh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) tang xa hoi. hieu van cam tuc va hanh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) tang xa hoi. hieu van cam tuc va hanh vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) tang xa hoi. hieu van cam tuc va hanh vai ((cua tre) OR (cuu tre))*.