Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
va hanh » van hanh, va thanh, va danh
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
sach ky » sac ky, sach y, sach kem
tang xa » trang xa, tang ma, lang xa
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo

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 (sach ty)) tang xa hoi. hieu van lam duc va hanh vi ((cua viet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) tang xa hoi. hieu van lam duc va hanh vi ((cua viet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) tang xa hoi. hieu van lam duc va hanh vi ((cua viet) or (cuu tre))*.